Apply travis yml formatting
Apply travis yml formatting

This uses the auto formatting applied by the `travis` cli tool
(https://github.com/travis-ci/travis.rb#readme). Keeping this format
allows to use the tool to modify the configuration.

tomashaber/raiden,hackaugusto/raiden,tomashaber/raiden,hackaugusto/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden