Remove gemnasium badge

See: https://docs.gitlab.com/ee/user/project/import/gemnasium.html

README.md

@@ -6,7 +6,6 @@
 [![Coverage Status next-minor](https://coveralls.io/repos/github/diaspora/diaspora/badge.svg?branch=next-minor)](https://coveralls.io/github/diaspora/diaspora?branch=next-minor)|
 **develop:** [![Build Status develop](https://secure.travis-ci.org/diaspora/diaspora.svg?branch=develop)](http://travis-ci.org/diaspora/diaspora)
 [![Coverage Status develop](https://coveralls.io/repos/github/diaspora/diaspora/badge.svg?branch=develop)](https://coveralls.io/github/diaspora/diaspora?branch=develop) |
-[![Dependency Status](https://gemnasium.com/badges/github.com/diaspora/diaspora.svg)](https://gemnasium.com/diaspora/diaspora)
 [![Code Climate](https://codeclimate.com/github/diaspora/diaspora/badges/gpa.svg)](https://codeclimate.com/github/diaspora/diaspora)
 
 [Project site](https://diasporafoundation.org) |