Fix link to coveralls

Author: nepalez

README.md

@@ -4,7 +4,7 @@
 [![Build Status](https://travis-ci.org/dry-rb/dry-initializer.svg?branch=master)][travis]
 [![Dependency Status](https://gemnasium.com/dry-rb/dry-initializer.svg)][gemnasium]
 [![Code Climate](https://codeclimate.com/github/dry-rb/dry-initializer/badges/gpa.svg)][codeclimate]
-[![Test Coverage](https://codeclimate.com/github/dry-rb/dry-initializer/badges/coverage.svg)][codeclimate]
+[![Test Coverage](https://codeclimate.com/github/dry-rb/dry-initializer/badges/coverage.svg)][coveralls]
 [![Inline docs](http://inch-ci.org/github/dry-rb/dry-initializer.svg?branch=master)][inchpages]
 
 [gem]: https://rubygems.org/gems/dry-initializer