Update the CI badge in README and in the docs

Update from Travis to GH Actions

Author: alongd

README.md

@@ -5,7 +5,7 @@
 # The Tandem Tool (T3) for automated kinetic model generation and refinement
 
 ![Release](https://img.shields.io/badge/version-0.1.0-blue.svg)
-[![Build Status](https://travis-ci.com/ReactionMechanismGenerator/T3.svg?branch=master)](https://travis-ci.com/ReactionMechanismGenerator/T3)
+![Build Status](https://github.com/ReactionMechanismGenerator/T3/actions/workflows/cont_int.yml/badge.svg)
 [![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/ReactionMechanismGenerator/T3.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/ReactionMechanismGenerator/T3/context:python)
 [![codecov](https://codecov.io/gh/ReactionMechanismGenerator/T3/branch/master/graph/badge.svg)](https://codecov.io/gh/ReactionMechanismGenerator/T3)
 [![MIT license](http://img.shields.io/badge/license-MIT-brightgreen.svg)](http://opensource.org/licenses/MIT)

docs/index.md

@@ -9,9 +9,7 @@
 <a href="https://github.com/ReactionMechanismGenerator/T3/releases" target="_blank">
     <img src="https://img.shields.io/badge/version-0.1.0-blue.svg" alt="Release">
 </a>
-<a href="https://travis-ci.com/ReactionMechanismGenerator/T3" target="_blank">
-    <img src="https://travis-ci.com/ReactionMechanismGenerator/T3.svg?branch=master" alt="Build Status">
-</a>
+<img src="https://github.com/ReactionMechanismGenerator/T3/actions/workflows/cont_int.yml/badge.svg" alt="Build Status">
 <a href="https://lgtm.com/projects/g/ReactionMechanismGenerator/T3/context:python" target="_blank">
     <img src="https://img.shields.io/lgtm/grade/python/g/ReactionMechanismGenerator/T3.svg?logo=lgtm&logoWidth=18" alt="Language grade: Python">
 </a>