matterircd v0.25.0

New features

• general: Add automated docker builds
• general: Allow overriding handshake timeout. Fixes #438 (#439)
• mattermost: Support saving last viewed at state for multiple users (mattermost) (#425)
• mattermost: Add mattermost 6 support (#452)
• mattermost: Allow overriding client timeout (mattermost) (#449)
• mattermost: Allow overriding the anti-idle channel and interval (mattermost) (#441)

Bugfix

• general: Fix word boundary and grammar of error messages (#443)
• mattermost: Fix to ensure reply message is on the same line as last message line (mattermost) (#447)
• mattermost: Addition and removal of user to/from team from system (mattermost) (#442)
• slack: Fix segfault when bot user fetch fails (#440)

This release couldn't exist without the following contributors:
@hloeung, @Aketzu