Air Stapler

• This version removes support for debian Jessie due to the shutdown of
  jessie-backports.
• Removes Python 2 support, Python 3 should be sufficiently propagated.

Functionally not different from the previous version, which you can still use without issues but is now deprecated and will not receive any updates. If you are in dire need of a bugfix in the previous version, please drop us a word.