Matterbridge v0.5.0

This releases merges matterbridge-plus back in.

It also breaks a bit of configuration, removing redundant and unnecessary options.
See migration info for more information about the changes.

More documentation can be found in the sample configuration

New features

• SASL support
• Sync with mattermost 3.2.0

Bugfixes

• Fix possible corrupted messages
• Fix crash on invalid team
• Fix docker build