Version 2: New features, bugfixes, and PyPI

• pybaseball is now listed on the PyPI as pybaseball2. The package is still used as import pybaseball, but install it with pip install pybaseball2.
• New functionality:
  • Plot spray charts on stadium (#9, thanks to @andersonfrailey)
  • Baseball Reference game logs (#4, thanks to @reddigari)
  • More functions for Chadwick Bureau data (#8, thanks to @valdezt)
  • Exposes Chadwick Bureau lookup table (#7)
  • Top Prospects (#5, thanks to @TylerLiu42)
  • Full Season Statcast data (#2, @TylerLiu42)
  • Amateur Draft results (#11, @TylerLiu42)
• Bugfixes, with thanks to @bgunn34 and @TAThor