fix(git): add vendor in .gitignore

vendor/golang.org/x/text/secure/bidirule/bidirule10.0.0.go

@@ -1,12 +0,0 @@
-// Copyright 2016 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.
-
-//go:build go1.10
-// +build go1.10
-
-package bidirule
-
-func (t *Transformer) isFinal() bool {
-	return t.state == ruleLTRFinal || t.state == ruleRTLFinal || t.state == ruleInitial
-}