message: Update link to issue tracker
diff: @@ -20,7 +20,7 @@ including the `gittyup` tag. Remember to search for existing questions
  before creating a new one.
  Report bugs in Gittyup by opening an issue in the
  -[issue tracker](https://github.com/Murmele/gitahead/issues).
  +[issue tracker](https://github.com/Murmele/gittyup/issues).
  Remember to search for existing issues before creating a new one.
  If you still need help, check out our Matrix channel
  