README.md in ngt-0.3.1 vs README.md in ngt-0.3.2

- old
+ new

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