README.md in tdiary-5.1.5 vs README.md in tdiary-5.1.6

- old
+ new
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 # tDiary
 
 [![Deploy](https://www.herokucdn.com/deploy/button.png)](https://www.heroku.com/deploy?template=https://github.com/tdiary/tdiary-core)
 
-[![Gem Version](https://badge.fury.io/rb/tdiary.png)](https://rubygems.org/gems/tdiary) [![Build Status](https://secure.travis-ci.org/tdiary/tdiary-core.png)](https://travis-ci.org/tdiary/tdiary-core) [![Coverage Status](https://coveralls.io/repos/tdiary/tdiary-core/badge.png?branch=master)](https://coveralls.io/r/tdiary/tdiary-core) [![Code Climate](https://codeclimate.com/github/tdiary/tdiary-core.png)](https://codeclimate.com/github/tdiary/tdiary-core)
+[![Gem Version](https://badge.fury.io/rb/tdiary.png)](https://rubygems.org/gems/tdiary) [![Build Status](https://github.com/tdiary/tdiary-core/actions/workflows/ci.yml/badge.svg)](https://github.com/tdiary/tdiary-core/actions/workflows/ci.yml) [![Coverage Status](https://coveralls.io/repos/tdiary/tdiary-core/badge.png?branch=master)](https://coveralls.io/r/tdiary/tdiary-core) [![Code Climate](https://codeclimate.com/github/tdiary/tdiary-core.png)](https://codeclimate.com/github/tdiary/tdiary-core)
 
 ## tDiary, The TSUKKOMI-able Weblog.
 
 At first, see doc/README-en.rd