Berserk

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* Convert datetime string in tournament creation response into datetime object

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* Convert all timestamps to datetime in all responses
* Provide support for challenging other players to a game

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* Bump requests dependency to >-2.20.0 (CVE-2018-18074)

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* Add `position` and `start_date` params to `Tournament.create`
* Add `Position` enum

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* Fix an asine bug in the docs

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* Added tests for session and formats modules
* Fixed mispelled PgnHandler class (!)
* Fixed issue with trailing whitespace when splitting multiple PGN texts
* Fixed the usage overview in the README
* Fixed the versions for travis-ci
* Made it easier to test the `JsonHandler` class
* Salted the bumpversion config to taste