fix(git): add vendor in .gitignore

vendor/google.golang.org/protobuf/proto/proto_reflect.go

@@ -1,20 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// The protoreflect build tag disables use of fast-path methods.
-//go:build protoreflect
-// +build protoreflect
-
-package proto
-
-import (
-	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/runtime/protoiface"
-)
-
-const hasProtoMethods = false
-
-func protoMethods(m protoreflect.Message) *protoiface.Methods {
-	return nil
-}