v0.5.0 - pytest and Codecov

• pytest integration, Codecov integration
• project-wide code documentation and clean-up
• no longer test Python 3.4 builds (only Python 3.5+ for pytest 5.x.y)
• bugfixes: column_index position, flatten_dict function
• general fix: typo in example config (Nucleotidet)
• method migration: HTTPErrorCatch
• reupload truncated gif files

~Rigorous Testing Arrives!~