Added
- create or use thread when sending message with `in_reply_to`.
- support of `DIVERT_TO_THREAD` option.
- ability to define custom event handlers.
- email field to Person object.
- cache attributes in order to prevent excessive http requests for Person object.
Changed
- room occupant no longer processed as list type.
- code formatted with black.
- message size limt to 16377 characters.
- return any combination of first name/surname for Person.fullname without trailing or leading space.
- moved project to official errbotio organisation https://github.com/errbotio/errbot-mattermost-backend.git
Removed