Added
- Update .travis.yml to support Python 3.7 ([38](https://github.com/henry0312/pytest-codestyle/pull/38))
Fixed
- fix install error on not locale environment (docker, etc...) ([34](https://github.com/henry0312/pytest-codestyle/pull/34))
- Open files in binary mode and then decode them as utf-8 ([37](https://github.com/henry0312/pytest-codestyle/pull/37))