diff --git a/vendor/github.com/json-iterator/go/go.sum b/vendor/github.com/json-iterator/go/go.sum
index d778b5a..be00a6d 100644
--- a/vendor/github.com/json-iterator/go/go.sum
+++ b/vendor/github.com/json-iterator/go/go.sum
@@ -9,6 +9,7 @@
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
diff --git a/vendor/github.com/json-iterator/go/iter_float.go b/vendor/github.com/json-iterator/go/iter_float.go
index b975463..8a3d8b6 100644
--- a/vendor/github.com/json-iterator/go/iter_float.go
+++ b/vendor/github.com/json-iterator/go/iter_float.go
@@ -288,6 +288,9 @@
 				return iter.readFloat64SlowPath()
 			}
 			value = (value << 3) + (value << 1) + uint64(ind)
+			if value > maxFloat64 {
+				return iter.readFloat64SlowPath()
+			}
 		}
 	}
 	return iter.readFloat64SlowPath()
diff --git a/vendor/github.com/json-iterator/go/iter_int.go b/vendor/github.com/json-iterator/go/iter_int.go
index 2142320..d786a89 100644
--- a/vendor/github.com/json-iterator/go/iter_int.go
+++ b/vendor/github.com/json-iterator/go/iter_int.go
@@ -9,6 +9,7 @@
 
 const uint32SafeToMultiply10 = uint32(0xffffffff)/10 - 1
 const uint64SafeToMultiple10 = uint64(0xffffffffffffffff)/10 - 1
+const maxFloat64 = 1<<53 - 1
 
 func init() {
 	intDigits = make([]int8, 256)
@@ -339,7 +340,7 @@
 }
 
 func (iter *Iterator) assertInteger() {
-	if iter.head < len(iter.buf) && iter.buf[iter.head] == '.' {
+	if iter.head < iter.tail && iter.buf[iter.head] == '.' {
 		iter.ReportError("assertInteger", "can not decode float as int")
 	}
 }
diff --git a/vendor/github.com/json-iterator/go/reflect.go b/vendor/github.com/json-iterator/go/reflect.go
index 74974ba..39acb32 100644
--- a/vendor/github.com/json-iterator/go/reflect.go
+++ b/vendor/github.com/json-iterator/go/reflect.go
@@ -65,7 +65,7 @@
 	decoder := iter.cfg.getDecoderFromCache(cacheKey)
 	if decoder == nil {
 		typ := reflect2.TypeOf(obj)
-		if typ.Kind() != reflect.Ptr {
+		if typ == nil || typ.Kind() != reflect.Ptr {
 			iter.ReportError("ReadVal", "can only unmarshal into pointer")
 			return
 		}
diff --git a/vendor/github.com/json-iterator/go/reflect_json_raw_message.go b/vendor/github.com/json-iterator/go/reflect_json_raw_message.go
index f261993..eba434f 100644
--- a/vendor/github.com/json-iterator/go/reflect_json_raw_message.go
+++ b/vendor/github.com/json-iterator/go/reflect_json_raw_message.go
@@ -33,11 +33,19 @@
 }
 
 func (codec *jsonRawMessageCodec) Decode(ptr unsafe.Pointer, iter *Iterator) {
-	*((*json.RawMessage)(ptr)) = json.RawMessage(iter.SkipAndReturnBytes())
+	if iter.ReadNil() {
+		*((*json.RawMessage)(ptr)) = nil
+	} else {
+		*((*json.RawMessage)(ptr)) = iter.SkipAndReturnBytes()
+	}
 }
 
 func (codec *jsonRawMessageCodec) Encode(ptr unsafe.Pointer, stream *Stream) {
-	stream.WriteRaw(string(*((*json.RawMessage)(ptr))))
+	if *((*json.RawMessage)(ptr)) == nil {
+		stream.WriteNil()
+	} else {
+		stream.WriteRaw(string(*((*json.RawMessage)(ptr))))
+	}
 }
 
 func (codec *jsonRawMessageCodec) IsEmpty(ptr unsafe.Pointer) bool {
@@ -48,11 +56,19 @@
 }
 
 func (codec *jsoniterRawMessageCodec) Decode(ptr unsafe.Pointer, iter *Iterator) {
-	*((*RawMessage)(ptr)) = RawMessage(iter.SkipAndReturnBytes())
+	if iter.ReadNil() {
+		*((*RawMessage)(ptr)) = nil
+	} else {
+		*((*RawMessage)(ptr)) = iter.SkipAndReturnBytes()
+	}
 }
 
 func (codec *jsoniterRawMessageCodec) Encode(ptr unsafe.Pointer, stream *Stream) {
-	stream.WriteRaw(string(*((*RawMessage)(ptr))))
+	if *((*RawMessage)(ptr)) == nil {
+		stream.WriteNil()
+	} else {
+		stream.WriteRaw(string(*((*RawMessage)(ptr))))
+	}
 }
 
 func (codec *jsoniterRawMessageCodec) IsEmpty(ptr unsafe.Pointer) bool {
diff --git a/vendor/github.com/json-iterator/go/reflect_struct_decoder.go b/vendor/github.com/json-iterator/go/reflect_struct_decoder.go
index d7eb0eb..92ae912 100644
--- a/vendor/github.com/json-iterator/go/reflect_struct_decoder.go
+++ b/vendor/github.com/json-iterator/go/reflect_struct_decoder.go
@@ -1075,6 +1075,11 @@
 }
 
 func (decoder *stringModeNumberDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
+	if iter.WhatIsNext() == NilValue {
+		decoder.elemDecoder.Decode(ptr, iter)
+		return
+	}
+
 	c := iter.nextToken()
 	if c != '"' {
 		iter.ReportError("stringModeNumberDecoder", `expect ", but found `+string([]byte{c}))