Moved endpoint version out of base_url.

Riot has different endpoint versions for different points.  For example,
champion is 1.1 but league is 2.1.  This allows each module to implement
their own endpoint version.
Merge pull request #8 from pcg79/move_version_out_of_base_path

Moved endpoint version out of base_url.
Update changelog
Update Changelog, bump up version number