Update coveralls badge

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

README.md

@@ -23,7 +23,7 @@
 - [![Code Climate](https://codeclimate.com/github/gitlabhq/gitlabhq.svg)](https://codeclimate.com/github/gitlabhq/gitlabhq)
-- [![Coverage Status](https://coveralls.io/repos/gitlabhq/gitlabhq/badge.png?branch=master)](https://coveralls.io/r/gitlabhq/gitlabhq)
+- [![Coverage Status](https://coveralls.io/repos/gitlabhq/gitlabhq/badge.png?branch=master)](https://coveralls.io/r/gitlabhq/gitlabhq?branch=master)
 - [![PullReview stats](https://www.pullreview.com/gitlab/gitlab-org/gitlab-ce/badges/master.svg?)](https://www.pullreview.com/gitlab.gitlab.com/gitlab-org/gitlab-ce/reviews/master)