Thank you for your contribution!

Before creating a Pull Request, please make sure to
* read https://github.com/igniterealtime/Smack/wiki/Guidelines-for-Smack-Developers-and-Contributors
* run `gradle check` successfully in order to make sure that your code does not break any JUnit tests and is conform to the projects code style.
* (if applicable) mention any Jira issue codes (eg. `SMACK-XXX`) in the *body* of your commit message (not the header), so that Jira automatically links the PR to the issue.
* squash your commits if possible/sensible.
