Use flake8 to automatically find errors on all PRs
Use flake8 to automatically find errors on all PRs

> [Kicking myself over these kind of errors](https://github.com/PhilipTrauner/cmus-osx/pull/14#issuecomment-350962706)

Using Travis Continuous Integration to run flake8 tests to find these issues automatically.  This service is free for open source projects.  The owner of the this repo would need to go to https://travis-ci.org/profile and flip the repository switch __on__ to enable free automated flake8 testing of each pull request.
azadkuh/cmus-osx,PhilipTrauner/cmus-osx