dot package:parallel

Compose two strategies sequentially. This is the analogue to function composition on strategies. For any strategies strat1, strat2, and strat3,

(strat1 `dot` strat2) `dot` strat3 == strat1 `dot` (strat2 `dot` strat3)
strat1 `dot` strat1 = strat1
strat1 `dot` r0 == strat1

strat2 `dot` strat1 == strat2 . withStrategy strat1