v4.6.0, 2019-05-20
New history class, new strategy from Axelrod's first tournament and a number of
internal fixes/improvements.
- A new history class: #1241
- Minor internal fixes: #1236
#1237
#1243
- Test speed up and refactor:
#1238
- New strategy (Graaskamp from RA's first tournament):
#1244
v4.6.0...v4.5.0
