Update build badge

Author: SleeplessByte

README.md

@@ -1,5 +1,5 @@
 # MediaTypes
-[![Build Status](https://travis-ci.com/SleeplessByte/media-types-ruby.svg?branch=master)](https://travis-ci.com/SleeplessByte/media-types-ruby)
+[![Build Status](https://github.com/SleeplessByte/media-types-ruby/workflows/Ruby/badge.svg?branch=master)](https://github.com/SleeplessByte/media-types-ruby/actions?query=workflow%3ARuby)
 [![Gem Version](https://badge.fury.io/rb/media_types.svg)](https://badge.fury.io/rb/media_types)
 [![MIT license](http://img.shields.io/badge/license-MIT-brightgreen.svg)](http://opensource.org/licenses/MIT) 
 [![Maintainability](https://api.codeclimate.com/v1/badges/6f2dc1fb37ecb98c4363/maintainability)](https://codeclimate.com/github/SleeplessByte/media-types-ruby/maintainability)