v0.3.0

Enhancements

• Add parameter to generate_exp_id() (#115)
• add episode length statistics to evaluator (#121, thanks @tkelestemur!)
• call evaluation_hooks in Evaluator (#122)
• Remove six dependency in pre-trained models (#148)

Bug fixes

• Fix an error related to collation and RNN (#129, thanks @tarokiritani!)
• fix IndexError due to empty stack (#133, thanks @lerrytang!)

Documentation

• Adds pretrained models column to README (#119)
• Adds mypy to contributing md (#125)
• Updates BibTeX to JMLR paper (#134)
• Adds link to paper (#135)
• Adds links to blog posts in the README (#137)
• Fix NormalizeActionSpace's comment (#142)

Testing

• Use latest black (#116)
• Switch to mypy>=0.800 (#127)