Update godeps for etcd 3.0.4

vendor/github.com/gogo/protobuf/proto/extensions.go

@@ -403,7 +403,6 @@ func decodeExtension(b []byte, extension *ExtensionDesc) (interface{}, error) {
 	o := NewBuffer(b)
 
 	t := reflect.TypeOf(extension.ExtensionType)
-	rep := extension.repeated()
 
 	props := extensionProperties(extension)
 
@@ -425,7 +424,7 @@ func decodeExtension(b []byte, extension *ExtensionDesc) (interface{}, error) {
 			return nil, err
 		}
 
-		if !rep || o.index >= len(o.buf) {
+		if o.index >= len(o.buf) {
 			break
 		}
 	}