Rebase to Alpine 3.9.
- Show the number of downtimes and total downtime minutes in monthly reports (#104)
- Show the number of downtimes and total downtime minutes in "Check Details" page
- Add the
- Add Mattermost integration (#276)
- Three choices in timezone switcher (UTC / check's timezone / browser's timezone) (#278)
- After adding a new check redirect to the "Check Details" page
- Don't show the "Sign Up" link in the login page if registration is closed (#280)