Adjust that S&R is now implemented.

drvinceknight · drvinceknight · commit 12f1e09bcb7c · 2017-05-23T11:02:33.000+01:00
diff --git a/docs/reference/overview_of_strategies.rst b/docs/reference/overview_of_strategies.rst
@@ -137,8 +137,6 @@ the opponent defects when this strategy cooperates.
 Stein and Rapoport
 ^^^^^^^^^^^^^^^^^^
 
-**Not implemented yet**
-
 This strategy plays a modification of Tit For Tat.
 
 1. It cooperates for the first 4 moves.
