Add support for `badtime`

[MrJoy]

https://github.com/m3db/build-tools/tree/master/linters/badtime

This strikes me as a good candidate for inclusion here.

[jirfag]

Pull requests are welcome :)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.