Robert Hailey 40bf204058 chat: When a user leaves, add time since they joined to the exit message.
* Show the connection duration upon departure

* humantime: ugly sub-second precision replaces grammatically incorrect "1 seconds" message

* simplify function name

* humantime: repair unit test

* move: util/humantime -> internal/humantime

* go fmt everything
2019-01-02 15:46:21 -05:00
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