Pypgn

- Automatically share version across project config files
- Automatically share author across conf files

* Add argument safety to several public methods

* Implement test for non existing tag in PGN file tags

* Remove redundant test and add safety to http conns

* Rename public methods to be shorter

* Bump version to minor and update README

* Add event getter, improve missing tag exception test

* Remove duplicate dependency pytest

You can now omit a game when initialising a Game object and provide it later.

Add support for Lichess study and game ID as passed argument to Game constructor

- Completely cover Game class with tests
- Fix some small bugs
- Remove Python < 3.6 support
- Integrate Travis CI
- Improve naming of some methods
- Create makefile