Changelog

Add support for Mattermost notifier
- 5c6edc9 Initial skeleton with some implementation for Mattermost notifier, forked from slack notifier as they use the same API
- eefd410 Updated environment variables to use MATTERMOST_ prefix and improved formatting for no channel message
- 53ac740 Updated README to include template more suited to limitations of Mattermost and added image of integration
9629cc9 Updated module path to work with go get until mercari#119 is approved
- 8d4007a Tided mod

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