Update README.md

Fixed a typo.
Made Coup de Grace's test work properly. Also adjusted bias in MctsPlayer's beforeStartingThreads in order to balance coup de grace mode.
Merge branch 'master' into fix_coup_de_grace_2_electric_boogaloo
Removed println's from MctsPlayer that were only used for testing.
Merge branch 'late_opening_book' of ssh://github.com/Orego/Orego into late_opening_book
Added the LateOpeningBook to Orego, which gives moves on line 3 around the board's edges in wide open spaces.