diff --git a/vendor/github.com/mongodb/mongo-go-driver/x/network/command/count.go b/vendor/github.com/mongodb/mongo-go-driver/x/network/command/count.go
new file mode 100644
index 0000000..419a78b
--- /dev/null
+++ b/vendor/github.com/mongodb/mongo-go-driver/x/network/command/count.go
@@ -0,0 +1,128 @@
+// 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 command
+
+import (
+	"context"
+	"errors"
+
+	"github.com/mongodb/mongo-go-driver/bson"
+	"github.com/mongodb/mongo-go-driver/mongo/readconcern"
+	"github.com/mongodb/mongo-go-driver/mongo/readpref"
+	"github.com/mongodb/mongo-go-driver/x/bsonx"
+	"github.com/mongodb/mongo-go-driver/x/bsonx/bsoncore"
+	"github.com/mongodb/mongo-go-driver/x/mongo/driver/session"
+	"github.com/mongodb/mongo-go-driver/x/network/description"
+	"github.com/mongodb/mongo-go-driver/x/network/wiremessage"
+)
+
+// Count represents the count command.
+//
+// The count command counts how many documents in a collection match the given query.
+type Count struct {
+	NS          Namespace
+	Query       bsonx.Doc
+	Opts        []bsonx.Elem
+	ReadPref    *readpref.ReadPref
+	ReadConcern *readconcern.ReadConcern
+	Clock       *session.ClusterClock
+	Session     *session.Client
+
+	result int64
+	err    error
+}
+
+// Encode will encode this command into a wire message for the given server description.
+func (c *Count) Encode(desc description.SelectedServer) (wiremessage.WireMessage, error) {
+	cmd, err := c.encode(desc)
+	if err != nil {
+		return nil, err
+	}
+
+	return cmd.Encode(desc)
+}
+
+func (c *Count) encode(desc description.SelectedServer) (*Read, error) {
+	if err := c.NS.Validate(); err != nil {
+		return nil, err
+	}
+
+	command := bsonx.Doc{{"count", bsonx.String(c.NS.Collection)}, {"query", bsonx.Document(c.Query)}}
+	command = append(command, c.Opts...)
+
+	return &Read{
+		Clock:       c.Clock,
+		DB:          c.NS.DB,
+		ReadPref:    c.ReadPref,
+		Command:     command,
+		ReadConcern: c.ReadConcern,
+		Session:     c.Session,
+	}, nil
+}
+
+// Decode will decode the wire message using the provided server description. Errors during decoding
+// are deferred until either the Result or Err methods are called.
+func (c *Count) Decode(desc description.SelectedServer, wm wiremessage.WireMessage) *Count {
+	rdr, err := (&Read{}).Decode(desc, wm).Result()
+	if err != nil {
+		c.err = err
+		return c
+	}
+
+	return c.decode(desc, rdr)
+}
+
+func (c *Count) decode(desc description.SelectedServer, rdr bson.Raw) *Count {
+	val, err := rdr.LookupErr("n")
+	switch {
+	case err == bsoncore.ErrElementNotFound:
+		c.err = errors.New("invalid response from server, no 'n' field")
+		return c
+	case err != nil:
+		c.err = err
+		return c
+	}
+
+	switch val.Type {
+	case bson.TypeInt32:
+		c.result = int64(val.Int32())
+	case bson.TypeInt64:
+		c.result = val.Int64()
+	case bson.TypeDouble:
+		c.result = int64(val.Double())
+	default:
+		c.err = errors.New("invalid response from server, value field is not a number")
+	}
+
+	return c
+}
+
+// Result returns the result of a decoded wire message and server description.
+func (c *Count) Result() (int64, error) {
+	if c.err != nil {
+		return 0, c.err
+	}
+	return c.result, nil
+}
+
+// Err returns the error set on this command.
+func (c *Count) Err() error { return c.err }
+
+// RoundTrip handles the execution of this command using the provided wiremessage.ReadWriter.
+func (c *Count) RoundTrip(ctx context.Context, desc description.SelectedServer, rw wiremessage.ReadWriter) (int64, error) {
+	cmd, err := c.encode(desc)
+	if err != nil {
+		return 0, err
+	}
+
+	rdr, err := cmd.RoundTrip(ctx, desc, rw)
+	if err != nil {
+		return 0, err
+	}
+
+	return c.decode(desc, rdr).Result()
+}