Add Coverage Badges

Author: christophersmith262

README.md

@@ -1,3 +1,6 @@
+[![Build Status](https://travis-ci.org/christophersmith262/drupal-libraries-webpack-plugin.svg?branch=master)](https://travis-ci.org/christophersmith262/drupal-libraries-webpack-plugin)
+[![Coverage Status](https://coveralls.io/repos/github/christophersmith262/drupal-libraries-webpack-plugin/badge.svg?branch=master)](https://coveralls.io/github/christophersmith262/drupal-libraries-webpack-plugin?branch=master)
+
 <div align="center">
   <!-- replace with accurate logo e.g from https://worldvectorlogo.com/ -->
   <img height="200" src="https://www.drupal.org/files/druplicon-small.png">