Pychallonge

**Improvements**

- Convert CHANGELOG to markdown format
- Convert README to markdown format
- Add extra information about the handover of this module from Russ Amos

**Bugfixes**

- Fix issue with packaging

**Bugfixes**

- Fix issue with user-agent on HTTP requests. The Challonge API does
not respond with the requests module default user-agent

**Improvements**

- Add support for tournaments.open_for_predictions endpoint

**Improvements**

- Add support for the new endpoints mark and umark as underway for
matches
- Pin versions for dependencies

**Bugfixes**

- Fix parsing issues with fields: name, display_name,
display_name_with_invitation_email_address, username,
challonge_username