README.md in ngt-0.4.2 vs README.md in ngt-0.5.0

- old
+ new

@@ -1,9 +1,9 @@
 # NGT Ruby
 
 [NGT](https://github.com/yahoojapan/NGT) - high-speed approximate nearest neighbors - for Ruby
 
-[![Build Status](https://github.com/ankane/ngt-ruby/workflows/build/badge.svg?branch=master)](https://github.com/ankane/ngt-ruby/actions)
+[![Build Status](https://github.com/ankane/ngt-ruby/actions/workflows/build.yml/badge.svg)](https://github.com/ankane/ngt-ruby/actions)
 
 ## Installation
 
 Add this line to your application’s Gemfile: