Koji 1.13 release

[Michael McLean]

Koji 1.13 is out. Thanks to everyone who contributed!
You can read the release notes here:

https://docs.pagure.org/koji/release_notes_1.13/

Highlights:
- Python 3 support in client
- CLI plugins
- Improved log display in web ui

...and now on to 1.14 :)