Add missing vendor into vendor.conf.

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/github.com/json-iterator/go/feature_adapter.go

@@ -110,6 +110,7 @@ type Encoder struct {
 // Encode encode interface{} as JSON to io.Writer
 func (adapter *Encoder) Encode(val interface{}) error {
 	adapter.stream.WriteVal(val)
+	adapter.stream.WriteRaw("\n")
 	adapter.stream.Flush()
 	return adapter.stream.Error
 }
@@ -125,3 +126,8 @@ func (adapter *Encoder) SetEscapeHTML(escapeHTML bool) {
 	config.EscapeHTML = escapeHTML
 	adapter.stream.cfg = config.Froze().(*frozenConfig)
 }
+
+// Valid reports whether data is a valid JSON encoding.
+func Valid(data []byte) bool {
+	return ConfigDefault.Valid(data)
+}