add vendor directory

vendor/github.com/vmihailenco/msgpack/v5/msgpack.go

@@ -0,0 +1,52 @@
+package msgpack
+
+import "fmt"
+
+type Marshaler interface {
+	MarshalMsgpack() ([]byte, error)
+}
+
+type Unmarshaler interface {
+	UnmarshalMsgpack([]byte) error
+}
+
+type CustomEncoder interface {
+	EncodeMsgpack(*Encoder) error
+}
+
+type CustomDecoder interface {
+	DecodeMsgpack(*Decoder) error
+}
+
+//------------------------------------------------------------------------------
+
+type RawMessage []byte
+
+var (
+	_ CustomEncoder = (RawMessage)(nil)
+	_ CustomDecoder = (*RawMessage)(nil)
+)
+
+func (m RawMessage) EncodeMsgpack(enc *Encoder) error {
+	return enc.write(m)
+}
+
+func (m *RawMessage) DecodeMsgpack(dec *Decoder) error {
+	msg, err := dec.DecodeRaw()
+	if err != nil {
+		return err
+	}
+	*m = msg
+	return nil
+}
+
+//------------------------------------------------------------------------------
+
+type unexpectedCodeError struct {
+	code byte
+	hint string
+}
+
+func (err unexpectedCodeError) Error() string {
+	return fmt.Sprintf("msgpack: unexpected code=%x decoding %s", err.code, err.hint)
+}