Merge pull request #2101 from tsuyoshicho/fix/reawdmebadge

docs: Update README : using GHA badge

Author: h-east

README.md

@@ -1,6 +1,6 @@
 # vimdoc-ja-working
 
-[![Build Status](https://travis-ci.com/vim-jp/vimdoc-ja-working.svg?branch=master)](https://travis-ci.com/github/vim-jp/vimdoc-ja-working)
+[![Generate vim help](https://github.com/vim-jp/vimdoc-ja-working/actions/workflows/generate.yml/badge.svg)](https://github.com/vim-jp/vimdoc-ja-working/actions/workflows/generate.yml)
 
 Vim 付属のヘルプを日本語に翻訳するためのプロジェクトです。