Matterbridge v0.12.0

Changes

• general: edited messages are now being sent by default on discord/mattermost/telegram/slack. See "New Features"

New features

• general: add support for edited messages.
  Add new keyword EditDisable (false/true), default false. Which means by default edited messages will be sent to other bridges.
  Add new keyword EditSuffix , default "". You can change this eg to "(edited)", this will be appended to every edit message.
• mattermost: support mattermost v3.9.x
• general: Add support for HTTP{S}_PROXY env variables (#162)
• discord: Strip custom emoji metadata (discord). Closes #148

Bugfix

• slack: Ignore error on private channel join (slack) Fixes #150
• mattermost: fix crash on reconnects when server is down. Closes #163
• irc: Relay messages starting with ! (irc). Closes #164