docs: add test coverage badge

BREAKING CHANGE: must add this to force semantic-release to do its work.

Author: eliias

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/netiam/acl.svg)](https://travis-ci.org/netiam/acl)
 [![Dependencies](https://david-dm.org/netiam/acl.svg)](https://david-dm.org/netiam/acl)
-[![Code Climate](https://codeclimate.com/github/netiam/acl/badges/gpa.svg)](https://codeclimate.com/github/netiam/acl)
+[![Test Coverage](https://codeclimate.com/github/netiam/acl/badges/coverage.svg)](https://codeclimate.com/github/netiam/acl/coverage)
 
 > An ACL library w/ basic tests