Mattermostdriver

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Fixed
- Login failed in version 6.3.0 112

Thanks a lot to iprok for their contribution!

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Fixed
- Missing documentation endpoints 95
- Incorrect submit dialog 94
- Disconnect not working 91

Requirement changes
- websockets bumped from 8.1 to 9.1

Thanks a lot to unode and wonsungkang for their contribution!

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Added
- New keepalive option, `keepalive` and `keepalive_delay`, default `False` 86
- New `websocket_kw_args` option which is passed to the websocket library on `connect()` 86

Thanks a lot to ttuffin and attzonko for their contribution!

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Requirement changes
- websocket bumped from 6.0 to 8.1
- requests bumped from 2.20.0 to 2.25.1

Added
- Add Driver.disconnect function 80
- Raise errors from None to reduce traceback noise 69

Fixes
- Correct url for role by name 78
- Add oldest unread endpoint 76

Documentation:
- Improve documentation about verify 64

Thanks a lot to jneeven for his contribution!

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Added endpoints
- `IntegrationActions`

Thanks a lot to ritelle for his contribution!

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Fixes
- Log `WebSocket authentication failed` even if WebSocket authentication was successful

Thanks a lot to icedevml for his contribution!