Log Message:
Update ruby-airbrussh to 1.2.0.

## [1.2.0][] (2017-04-14)

* [#95](https://github.com/mattbrictson/airbrussh/pull/95): colorize LogMessage \ 
label on WARN level and above - [@klyonrad](https://github.com/klyonrad)
* [#106](https://github.com/mattbrictson/airbrussh/pull/106): Remove the \ 
`log_file` parameter from the `CommandFormatter#exit_message` method; it was \ 
unused - [@mattbrictson](https://github.com/mattbrictson)