Replace Travis CI with GitHub action.

Remove Travis CI config files and replace README badges with GitHub
actions.

github.com//issues/113

Author: ChrisCummins

.travis.yml

@@ -19,7 +19,6 @@
 
 exports_files([
     ".bettercodehub.yml",
-    ".travis.yml",
     "CONTRIBUTING.md",
     "LICENSE",
     "README.md",

BUILD

@@ -14,10 +14,10 @@
 </a>
 
 <!-- Build status -->
-| Branch | Travis CI | Better Code |
+| Branch | Test Suite | Code Quality |
 | ------ | --------- | ----------- |
-| [stable](https://github.com/ChrisCummins/ProGraML/tree/stable) | <a href="https://travis-ci.org/ChrisCummins/ProGraML"><img src="https://img.shields.io/travis/ChrisCummins/ProGraML/stable.svg"></a> | <a href="https://bettercodehub.com/results/ChrisCummins/ProGraML"><img src="https://bettercodehub.com/edge/badge/ChrisCummins/ProGraML?branch=stable"></a> |
-| [development](https://github.com/ChrisCummins/ProGraML/tree/development) | <a href="https://travis-ci.org/ChrisCummins/ProGraML"><img src="https://img.shields.io/travis/ChrisCummins/ProGraML/development.svg"></a> | <a href="https://bettercodehub.com/results/ChrisCummins/ProGraML"><img src="https://bettercodehub.com/edge/badge/ChrisCummins/ProGraML?branch=development"></a> |
+| [stable](https://github.com/ChrisCummins/ProGraML/tree/stable) | [![stable](https://github.com/ChrisCummins/ProGraML/workflows/CI/badge.svg?branch=stable)](https://github.com/ChrisCummins/ProGraML/actions?query=workflow%3ACI+branch%3Astable) | <a href="https://bettercodehub.com/results/ChrisCummins/ProGraML"><img src="https://bettercodehub.com/edge/badge/ChrisCummins/ProGraML?branch=stable"></a> |
+| [development](https://github.com/ChrisCummins/ProGraML/tree/development) | [![development](https://github.com/ChrisCummins/ProGraML/workflows/CI/badge.svg?branch=development)](https://github.com/ChrisCummins/ProGraML/actions?query=workflow%3ACI+branch%3Adevelopment) | <a href="https://bettercodehub.com/results/ChrisCummins/ProGraML"><img src="https://bettercodehub.com/edge/badge/ChrisCummins/ProGraML?branch=development"></a> |
 
 
 ProGraML is a representation for programs as input to a machine learning model.

README.md

@@ -1,7 +1,6 @@
 exports_files([
     "bazel",
     "bazel_env.sh",
-    "Brewfile.travis",
     "flaky_bazel.sh",
     "make_bootstrap.py",
     "README.md",