Add build status for github action

Author: kcotto

README.md

@@ -1,5 +1,4 @@
-[![Build Status](https://travis-ci.org/griffithlab/regtools.svg?branch=master)](https://travis-ci.org/griffithlab/regtools)
-![Build Status - Github Actions](https://github.com/griffithlab/regtools/actions/workflows/cmake.yml/badge.svg?branch=kcotto-patch-1)
+![Build Status](https://github.com/griffithlab/regtools/actions/workflows/cmake.yml/badge.svg?branch=master)
 [![Documentation Status](https://readthedocs.org/projects/regtools/badge/?version=latest)](https://readthedocs.org/projects/regtools/?badge=latest)
 [![Coverage Status](https://coveralls.io/repos/griffithlab/regtools/badge.svg?branch=master&service=github)](https://coveralls.io/github/griffithlab/regtools?branch=master)