message: Adds code marks in CONTRIBUTING.md
diff: @@ -5,9 +5,9 @@ Please just chat with us on gitter :)
  But in generall you have to follow these steps:
  1. Fork it
  -2. Create your feature branch (git checkout -b my-new-feature)
  -3. Commit your changes (git commit -am 'Add some feature')
  -4. Push to the branch (git push origin my-new-feature)
  +2. Create your feature branch (`git checkout -b my-new-feature`)
  +3. Commit your changes (`git commit -am 'Add some feature'`)
  +4. Push to the branch (`git push origin my-new-feature`)
  5. Create new Pull Request
  Please note that we only accept PRs with a running CI and properly written tests!
  