update readme with build status

Author: rcclemente

README.md

@@ -2,7 +2,7 @@ Send 405 response for ActionController::UnknownHttpMethod exceptions
 
 Travis CI
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-[![Build Status](https://travis-ci.org/rcclemente/http_method_not_allowed_middleware.png)](https://travis-ci.org/rcclemente/http_method_not_allowed_middleware)
+[![Build Status](https://github.com/rcclemente/http_method_not_allowed_middleware/workflows/Ruby/badge.svg)](https://github.com/rcclemente/http_method_not_allowed_middleware/actions)
 [![Gem Version](https://badge.fury.io/rb/http_method_not_allowed_middleware.svg)](https://badge.fury.io/rb/http_method_not_allowed_middleware)
 
 Install