Go random as a last resort

This does 2% better against the probability player with no change against the
other players.
Doing about 17% better against the ProbabilityPlayer

It looks like the ProbabilityPlayer playes scissors more often than not.
Therefore as a last resort we play :rock. Most other players are caught before
taking this option.

Tournament with 1000000 iterations
-----------------------------------
NaruogaBawdoPlayer - 84.0
RandomPlayer - 50.02
ProbabilityPlayer - 48.56
RockPlayer - 47.23
NotRockPlayer - 46.03
ScissorsPlayer - 45.32
SequencePlayer - 42.86
PaperPlayer - 35.98
-----------------------------------
Results for NaruogaBawdoPlayer
vs PaperPlayer: 100.0
vs SequencePlayer: 100.0
vs RockPlayer: 100.0
vs ScissorsPlayer: 100.0
vs NotRockPlayer: 62.44
vs ProbabilityPlayer: 75.54 # Previously around 58%
vs RandomPlayer: 50.03