v0.3.0, 2020-02-03
    c4ff400 more testing
    5d6e654 upgrading to python3 and dropping support for python2
    7cad191 add more comments because these python internals are confusing
v0.2.0, 2018-03-24
    3a36113 rename to be more accurate
    26acc51 only classes can be made selfish
v0.1.0, 2018-03-23


