diff --git a/vendor/github.com/mongodb/mongo-go-driver/x/bsonx/primitive_codecs.go b/vendor/github.com/mongodb/mongo-go-driver/x/bsonx/primitive_codecs.go
new file mode 100644
index 0000000..b34f07d
--- /dev/null
+++ b/vendor/github.com/mongodb/mongo-go-driver/x/bsonx/primitive_codecs.go
@@ -0,0 +1,638 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonx
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+
+	"github.com/mongodb/mongo-go-driver/bson/bsoncodec"
+	"github.com/mongodb/mongo-go-driver/bson/bsonrw"
+	"github.com/mongodb/mongo-go-driver/bson/bsontype"
+)
+
+var primitiveCodecs PrimitiveCodecs
+
+var tDocument = reflect.TypeOf((Doc)(nil))
+var tMDoc = reflect.TypeOf((MDoc)(nil))
+var tArray = reflect.TypeOf((Arr)(nil))
+var tValue = reflect.TypeOf(Val{})
+var tElementSlice = reflect.TypeOf(([]Elem)(nil))
+
+// PrimitiveCodecs is a namespace for all of the default bsoncodec.Codecs for the primitive types
+// defined in this package.
+type PrimitiveCodecs struct{}
+
+// RegisterPrimitiveCodecs will register the encode and decode methods attached to PrimitiveCodecs
+// with the provided RegistryBuilder. if rb is nil, a new empty RegistryBuilder will be created.
+func (pc PrimitiveCodecs) RegisterPrimitiveCodecs(rb *bsoncodec.RegistryBuilder) {
+	if rb == nil {
+		panic(errors.New("argument to RegisterPrimitiveCodecs must not be nil"))
+	}
+
+	rb.
+		RegisterEncoder(tDocument, bsoncodec.ValueEncoderFunc(pc.DocumentEncodeValue)).
+		RegisterEncoder(tArray, bsoncodec.ValueEncoderFunc(pc.ArrayEncodeValue)).
+		RegisterEncoder(tValue, bsoncodec.ValueEncoderFunc(pc.ValueEncodeValue)).
+		RegisterEncoder(tElementSlice, bsoncodec.ValueEncoderFunc(pc.ElementSliceEncodeValue)).
+		RegisterDecoder(tDocument, bsoncodec.ValueDecoderFunc(pc.DocumentDecodeValue)).
+		RegisterDecoder(tArray, bsoncodec.ValueDecoderFunc(pc.ArrayDecodeValue)).
+		RegisterDecoder(tValue, bsoncodec.ValueDecoderFunc(pc.ValueDecodeValue)).
+		RegisterDecoder(tElementSlice, bsoncodec.ValueDecoderFunc(pc.ElementSliceDecodeValue))
+}
+
+// DocumentEncodeValue is the ValueEncoderFunc for *Document.
+func (pc PrimitiveCodecs) DocumentEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+	if !val.IsValid() || val.Type() != tDocument {
+		return bsoncodec.ValueEncoderError{Name: "DocumentEncodeValue", Types: []reflect.Type{tDocument}, Received: val}
+	}
+
+	if val.IsNil() {
+		return vw.WriteNull()
+	}
+
+	doc := val.Interface().(Doc)
+
+	dw, err := vw.WriteDocument()
+	if err != nil {
+		return err
+	}
+
+	return pc.encodeDocument(ec, dw, doc)
+}
+
+// DocumentDecodeValue is the ValueDecoderFunc for *Document.
+func (pc PrimitiveCodecs) DocumentDecodeValue(dctx bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if !val.CanSet() || val.Type() != tDocument {
+		return bsoncodec.ValueDecoderError{Name: "DocumentDecodeValue", Types: []reflect.Type{tDocument}, Received: val}
+	}
+
+	return pc.documentDecodeValue(dctx, vr, val.Addr().Interface().(*Doc))
+}
+
+func (pc PrimitiveCodecs) documentDecodeValue(dctx bsoncodec.DecodeContext, vr bsonrw.ValueReader, doc *Doc) error {
+
+	dr, err := vr.ReadDocument()
+	if err != nil {
+		return err
+	}
+
+	return pc.decodeDocument(dctx, dr, doc)
+}
+
+// ArrayEncodeValue is the ValueEncoderFunc for *Array.
+func (pc PrimitiveCodecs) ArrayEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+	if !val.IsValid() || val.Type() != tArray {
+		return bsoncodec.ValueEncoderError{Name: "ArrayEncodeValue", Types: []reflect.Type{tArray}, Received: val}
+	}
+
+	if val.IsNil() {
+		return vw.WriteNull()
+	}
+
+	arr := val.Interface().(Arr)
+
+	aw, err := vw.WriteArray()
+	if err != nil {
+		return err
+	}
+
+	for _, val := range arr {
+		dvw, err := aw.WriteArrayElement()
+		if err != nil {
+			return err
+		}
+
+		err = pc.encodeValue(ec, dvw, val)
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return aw.WriteArrayEnd()
+}
+
+// ArrayDecodeValue is the ValueDecoderFunc for *Array.
+func (pc PrimitiveCodecs) ArrayDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if !val.CanSet() || val.Type() != tArray {
+		return bsoncodec.ValueDecoderError{Name: "ArrayDecodeValue", Types: []reflect.Type{tArray}, Received: val}
+	}
+
+	ar, err := vr.ReadArray()
+	if err != nil {
+		return err
+	}
+
+	if val.IsNil() {
+		val.Set(reflect.MakeSlice(tArray, 0, 0))
+	}
+	val.SetLen(0)
+
+	for {
+		vr, err := ar.ReadValue()
+		if err == bsonrw.ErrEOA {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		var elem Val
+		err = pc.valueDecodeValue(dc, vr, &elem)
+		if err != nil {
+			return err
+		}
+
+		val.Set(reflect.Append(val, reflect.ValueOf(elem)))
+	}
+
+	return nil
+}
+
+// ElementSliceEncodeValue is the ValueEncoderFunc for []*Element.
+func (pc PrimitiveCodecs) ElementSliceEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+	if !val.IsValid() || val.Type() != tElementSlice {
+		return bsoncodec.ValueEncoderError{Name: "ElementSliceEncodeValue", Types: []reflect.Type{tElementSlice}, Received: val}
+	}
+
+	if val.IsNil() {
+		return vw.WriteNull()
+	}
+
+	return pc.DocumentEncodeValue(ec, vw, val.Convert(tDocument))
+}
+
+// ElementSliceDecodeValue is the ValueDecoderFunc for []*Element.
+func (pc PrimitiveCodecs) ElementSliceDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if !val.CanSet() || val.Type() != tElementSlice {
+		return bsoncodec.ValueDecoderError{Name: "ElementSliceDecodeValue", Types: []reflect.Type{tElementSlice}, Received: val}
+	}
+
+	if val.IsNil() {
+		val.Set(reflect.MakeSlice(val.Type(), 0, 0))
+	}
+
+	val.SetLen(0)
+
+	dr, err := vr.ReadDocument()
+	if err != nil {
+		return err
+	}
+	elems := make([]reflect.Value, 0)
+	for {
+		key, vr, err := dr.ReadElement()
+		if err == bsonrw.ErrEOD {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		var elem Elem
+		err = pc.elementDecodeValue(dc, vr, key, &elem)
+		if err != nil {
+			return err
+		}
+
+		elems = append(elems, reflect.ValueOf(elem))
+	}
+
+	val.Set(reflect.Append(val, elems...))
+	return nil
+}
+
+// ValueEncodeValue is the ValueEncoderFunc for *Value.
+func (pc PrimitiveCodecs) ValueEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+	if !val.IsValid() || val.Type() != tValue {
+		return bsoncodec.ValueEncoderError{Name: "ValueEncodeValue", Types: []reflect.Type{tValue}, Received: val}
+	}
+
+	v := val.Interface().(Val)
+
+	return pc.encodeValue(ec, vw, v)
+}
+
+// ValueDecodeValue is the ValueDecoderFunc for *Value.
+func (pc PrimitiveCodecs) ValueDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if !val.CanSet() || val.Type() != tValue {
+		return bsoncodec.ValueDecoderError{Name: "ValueDecodeValue", Types: []reflect.Type{tValue}, Received: val}
+	}
+
+	return pc.valueDecodeValue(dc, vr, val.Addr().Interface().(*Val))
+}
+
+// encodeDocument is a separate function that we use because CodeWithScope
+// returns us a DocumentWriter and we need to do the same logic that we would do
+// for a document but cannot use a Codec.
+func (pc PrimitiveCodecs) encodeDocument(ec bsoncodec.EncodeContext, dw bsonrw.DocumentWriter, doc Doc) error {
+	for _, elem := range doc {
+		dvw, err := dw.WriteDocumentElement(elem.Key)
+		if err != nil {
+			return err
+		}
+
+		err = pc.encodeValue(ec, dvw, elem.Value)
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return dw.WriteDocumentEnd()
+}
+
+// DecodeDocument haves decoding into a Doc from a bsonrw.DocumentReader.
+func (pc PrimitiveCodecs) DecodeDocument(dctx bsoncodec.DecodeContext, dr bsonrw.DocumentReader, pdoc *Doc) error {
+	return pc.decodeDocument(dctx, dr, pdoc)
+}
+
+func (pc PrimitiveCodecs) decodeDocument(dctx bsoncodec.DecodeContext, dr bsonrw.DocumentReader, pdoc *Doc) error {
+	if *pdoc == nil {
+		*pdoc = make(Doc, 0)
+	}
+	*pdoc = (*pdoc)[:0]
+	for {
+		key, vr, err := dr.ReadElement()
+		if err == bsonrw.ErrEOD {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		var elem Elem
+		err = pc.elementDecodeValue(dctx, vr, key, &elem)
+		if err != nil {
+			return err
+		}
+
+		*pdoc = append(*pdoc, elem)
+	}
+	return nil
+}
+
+func (pc PrimitiveCodecs) elementDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, key string, elem *Elem) error {
+	var val Val
+	switch vr.Type() {
+	case bsontype.Double:
+		f64, err := vr.ReadDouble()
+		if err != nil {
+			return err
+		}
+		val = Double(f64)
+	case bsontype.String:
+		str, err := vr.ReadString()
+		if err != nil {
+			return err
+		}
+		val = String(str)
+	case bsontype.EmbeddedDocument:
+		var embeddedDoc Doc
+		err := pc.documentDecodeValue(dc, vr, &embeddedDoc)
+		if err != nil {
+			return err
+		}
+		val = Document(embeddedDoc)
+	case bsontype.Array:
+		arr := reflect.New(tArray).Elem()
+		err := pc.ArrayDecodeValue(dc, vr, arr)
+		if err != nil {
+			return err
+		}
+		val = Array(arr.Interface().(Arr))
+	case bsontype.Binary:
+		data, subtype, err := vr.ReadBinary()
+		if err != nil {
+			return err
+		}
+		val = Binary(subtype, data)
+	case bsontype.Undefined:
+		err := vr.ReadUndefined()
+		if err != nil {
+			return err
+		}
+		val = Undefined()
+	case bsontype.ObjectID:
+		oid, err := vr.ReadObjectID()
+		if err != nil {
+			return err
+		}
+		val = ObjectID(oid)
+	case bsontype.Boolean:
+		b, err := vr.ReadBoolean()
+		if err != nil {
+			return err
+		}
+		val = Boolean(b)
+	case bsontype.DateTime:
+		dt, err := vr.ReadDateTime()
+		if err != nil {
+			return err
+		}
+		val = DateTime(dt)
+	case bsontype.Null:
+		err := vr.ReadNull()
+		if err != nil {
+			return err
+		}
+		val = Null()
+	case bsontype.Regex:
+		pattern, options, err := vr.ReadRegex()
+		if err != nil {
+			return err
+		}
+		val = Regex(pattern, options)
+	case bsontype.DBPointer:
+		ns, pointer, err := vr.ReadDBPointer()
+		if err != nil {
+			return err
+		}
+		val = DBPointer(ns, pointer)
+	case bsontype.JavaScript:
+		js, err := vr.ReadJavascript()
+		if err != nil {
+			return err
+		}
+		val = JavaScript(js)
+	case bsontype.Symbol:
+		symbol, err := vr.ReadSymbol()
+		if err != nil {
+			return err
+		}
+		val = Symbol(symbol)
+	case bsontype.CodeWithScope:
+		code, scope, err := vr.ReadCodeWithScope()
+		if err != nil {
+			return err
+		}
+		var doc Doc
+		err = pc.decodeDocument(dc, scope, &doc)
+		if err != nil {
+			return err
+		}
+		val = CodeWithScope(code, doc)
+	case bsontype.Int32:
+		i32, err := vr.ReadInt32()
+		if err != nil {
+			return err
+		}
+		val = Int32(i32)
+	case bsontype.Timestamp:
+		t, i, err := vr.ReadTimestamp()
+		if err != nil {
+			return err
+		}
+		val = Timestamp(t, i)
+	case bsontype.Int64:
+		i64, err := vr.ReadInt64()
+		if err != nil {
+			return err
+		}
+		val = Int64(i64)
+	case bsontype.Decimal128:
+		d128, err := vr.ReadDecimal128()
+		if err != nil {
+			return err
+		}
+		val = Decimal128(d128)
+	case bsontype.MinKey:
+		err := vr.ReadMinKey()
+		if err != nil {
+			return err
+		}
+		val = MinKey()
+	case bsontype.MaxKey:
+		err := vr.ReadMaxKey()
+		if err != nil {
+			return err
+		}
+		val = MaxKey()
+	default:
+		return fmt.Errorf("Cannot read unknown BSON type %s", vr.Type())
+	}
+
+	*elem = Elem{Key: key, Value: val}
+	return nil
+}
+
+// encodeValue does not validation, and the callers must perform validation on val before calling
+// this method.
+func (pc PrimitiveCodecs) encodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val Val) error {
+	var err error
+	switch val.Type() {
+	case bsontype.Double:
+		err = vw.WriteDouble(val.Double())
+	case bsontype.String:
+		err = vw.WriteString(val.StringValue())
+	case bsontype.EmbeddedDocument:
+		var encoder bsoncodec.ValueEncoder
+		encoder, err = ec.LookupEncoder(tDocument)
+		if err != nil {
+			break
+		}
+		err = encoder.EncodeValue(ec, vw, reflect.ValueOf(val.Document()))
+	case bsontype.Array:
+		var encoder bsoncodec.ValueEncoder
+		encoder, err = ec.LookupEncoder(tArray)
+		if err != nil {
+			break
+		}
+		err = encoder.EncodeValue(ec, vw, reflect.ValueOf(val.Array()))
+	case bsontype.Binary:
+		// TODO: FIX THIS (╯°□°）╯︵ ┻━┻
+		subtype, data := val.Binary()
+		err = vw.WriteBinaryWithSubtype(data, subtype)
+	case bsontype.Undefined:
+		err = vw.WriteUndefined()
+	case bsontype.ObjectID:
+		err = vw.WriteObjectID(val.ObjectID())
+	case bsontype.Boolean:
+		err = vw.WriteBoolean(val.Boolean())
+	case bsontype.DateTime:
+		err = vw.WriteDateTime(val.DateTime())
+	case bsontype.Null:
+		err = vw.WriteNull()
+	case bsontype.Regex:
+		err = vw.WriteRegex(val.Regex())
+	case bsontype.DBPointer:
+		err = vw.WriteDBPointer(val.DBPointer())
+	case bsontype.JavaScript:
+		err = vw.WriteJavascript(val.JavaScript())
+	case bsontype.Symbol:
+		err = vw.WriteSymbol(val.Symbol())
+	case bsontype.CodeWithScope:
+		code, scope := val.CodeWithScope()
+
+		var cwsw bsonrw.DocumentWriter
+		cwsw, err = vw.WriteCodeWithScope(code)
+		if err != nil {
+			break
+		}
+
+		err = pc.encodeDocument(ec, cwsw, scope)
+	case bsontype.Int32:
+		err = vw.WriteInt32(val.Int32())
+	case bsontype.Timestamp:
+		err = vw.WriteTimestamp(val.Timestamp())
+	case bsontype.Int64:
+		err = vw.WriteInt64(val.Int64())
+	case bsontype.Decimal128:
+		err = vw.WriteDecimal128(val.Decimal128())
+	case bsontype.MinKey:
+		err = vw.WriteMinKey()
+	case bsontype.MaxKey:
+		err = vw.WriteMaxKey()
+	default:
+		err = fmt.Errorf("%T is not a valid BSON type to encode", val.Type())
+	}
+
+	return err
+}
+
+func (pc PrimitiveCodecs) valueDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val *Val) error {
+	switch vr.Type() {
+	case bsontype.Double:
+		f64, err := vr.ReadDouble()
+		if err != nil {
+			return err
+		}
+		*val = Double(f64)
+	case bsontype.String:
+		str, err := vr.ReadString()
+		if err != nil {
+			return err
+		}
+		*val = String(str)
+	case bsontype.EmbeddedDocument:
+		var embeddedDoc Doc
+		err := pc.documentDecodeValue(dc, vr, &embeddedDoc)
+		if err != nil {
+			return err
+		}
+		*val = Document(embeddedDoc)
+	case bsontype.Array:
+		arr := reflect.New(tArray).Elem()
+		err := pc.ArrayDecodeValue(dc, vr, arr)
+		if err != nil {
+			return err
+		}
+		*val = Array(arr.Interface().(Arr))
+	case bsontype.Binary:
+		data, subtype, err := vr.ReadBinary()
+		if err != nil {
+			return err
+		}
+		*val = Binary(subtype, data)
+	case bsontype.Undefined:
+		err := vr.ReadUndefined()
+		if err != nil {
+			return err
+		}
+		*val = Undefined()
+	case bsontype.ObjectID:
+		oid, err := vr.ReadObjectID()
+		if err != nil {
+			return err
+		}
+		*val = ObjectID(oid)
+	case bsontype.Boolean:
+		b, err := vr.ReadBoolean()
+		if err != nil {
+			return err
+		}
+		*val = Boolean(b)
+	case bsontype.DateTime:
+		dt, err := vr.ReadDateTime()
+		if err != nil {
+			return err
+		}
+		*val = DateTime(dt)
+	case bsontype.Null:
+		err := vr.ReadNull()
+		if err != nil {
+			return err
+		}
+		*val = Null()
+	case bsontype.Regex:
+		pattern, options, err := vr.ReadRegex()
+		if err != nil {
+			return err
+		}
+		*val = Regex(pattern, options)
+	case bsontype.DBPointer:
+		ns, pointer, err := vr.ReadDBPointer()
+		if err != nil {
+			return err
+		}
+		*val = DBPointer(ns, pointer)
+	case bsontype.JavaScript:
+		js, err := vr.ReadJavascript()
+		if err != nil {
+			return err
+		}
+		*val = JavaScript(js)
+	case bsontype.Symbol:
+		symbol, err := vr.ReadSymbol()
+		if err != nil {
+			return err
+		}
+		*val = Symbol(symbol)
+	case bsontype.CodeWithScope:
+		code, scope, err := vr.ReadCodeWithScope()
+		if err != nil {
+			return err
+		}
+		var scopeDoc Doc
+		err = pc.decodeDocument(dc, scope, &scopeDoc)
+		if err != nil {
+			return err
+		}
+		*val = CodeWithScope(code, scopeDoc)
+	case bsontype.Int32:
+		i32, err := vr.ReadInt32()
+		if err != nil {
+			return err
+		}
+		*val = Int32(i32)
+	case bsontype.Timestamp:
+		t, i, err := vr.ReadTimestamp()
+		if err != nil {
+			return err
+		}
+		*val = Timestamp(t, i)
+	case bsontype.Int64:
+		i64, err := vr.ReadInt64()
+		if err != nil {
+			return err
+		}
+		*val = Int64(i64)
+	case bsontype.Decimal128:
+		d128, err := vr.ReadDecimal128()
+		if err != nil {
+			return err
+		}
+		*val = Decimal128(d128)
+	case bsontype.MinKey:
+		err := vr.ReadMinKey()
+		if err != nil {
+			return err
+		}
+		*val = MinKey()
+	case bsontype.MaxKey:
+		err := vr.ReadMaxKey()
+		if err != nil {
+			return err
+		}
+		*val = MaxKey()
+	default:
+		return fmt.Errorf("Cannot read unknown BSON type %s", vr.Type())
+	}
+
+	return nil
+}