Test
* Add a unit test for stream.FileHandler
* Add a unit test for github.SearchQueryString
* Add a unit test for github.Repository
Pull Requests
* Merge pull request [21](https://github-luctus/homoluctus/ghc/issues/21) from homoluctus/release/0.1.7
* Merge pull request [20](https://github-luctus/homoluctus/ghc/issues/20) from homoluctus/feature/support_output_dir
* Merge pull request [19](https://github-luctus/homoluctus/ghc/issues/19) from homoluctus/feature/convert_none_to_empty_str
* Merge pull request [18](https://github-luctus/homoluctus/ghc/issues/18) from homoluctus/feature/support_keyboard_interrupt