Correct citation key for Li2016.

Author: drvinceknight

axelrod/strategies/memorytwo.py

@@ -16,7 +16,7 @@ class MEM2(Player):
 
     Names:
 
-        - MEM2 [Li2014]_
+        - MEM2 [Li2016]_
     """
 
     name = 'MEM2'

docs/reference/bibliography.rst

@@ -25,7 +25,7 @@ documentation.
 .. [Kraines1989] Kraines, D. & Kraines, V. Theor Decis (1989) 26: 47.  doi:10.1007/BF00134056
 .. [Li2009] Li, J. & Kendall, G. (2009). A Strategy with Novel Evolutionary Features for the Iterated Prisoner’s Dilemma. Evolutionary Computation 17(2): 257–274.
 .. [Li2011] Li, J., Hingston, P., Member, S., & Kendall, G. (2011). Engineering Design of Strategies for Winning Iterated Prisoner ’ s Dilemma Competitions, 3(4), 348–360.
-.. [Li2014] Li, J. and Kendall, G. (2016). The Effect of Memory Size on the Evolutionary Stability of Strategies in Iterated Prisoner's Dilemma. IEEE Transactions on Evolutionary Computation, 18(6) 819-826
+.. [Li2016] Li, J. and Kendall, G. (2016). The Effect of Memory Size on the Evolutionary Stability of Strategies in Iterated Prisoner's Dilemma. IEEE Transactions on Evolutionary Computation, 18(6) 819-826
 .. [Mathieu2015] Mathieu, P. and Delahaye, J. (2015). New Winning Strategies
   for the Iterated Prisoner's Dilemma. Proceedings of the 2015
   International Conference on Autonomous Agents and Multiagent Systems.