Releases: Fix top border
Merge branch 'master' of https://github.com/StylishThemes/GitHub-Dark

* 'master' of https://github.com/StylishThemes/GitHub-Dark:
  Use proper class selector to colorize octicon-x
  clarifying and providing examples on the spacing
  README: improving readability; removing contribution list
  fix contributing links
  Add CONTRIBUTING.md file. Fixes #135
  Icons: Add red color to octicon-x