Update README.md

Author: sichkar-valentyn

README.md

@@ -54,11 +54,11 @@ The major component of the RL method is the table of weights - <b>Q-table</b> of
 
 ## Content
 Codes (it'll send you to appropriate folder):
-* [RL_Q-Learning_E-1](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Q-Learning_E1)
-* [RL_Q-Learning_E-2](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Q-Learning_E2)
-* [RL_Q-Learning_E-3](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Q-Learning_E3)
-* [RL_Sarsa_E-1](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Sarsa_E1)
-* [RL_Sarsa_E-2](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Sarsa_E2)
+* [RL_Q-Learning_E-1.py](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Q-Learning_E1)
+* [RL_Q-Learning_E-2.py](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Q-Learning_E2)
+* [RL_Q-Learning_E-3.py](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Q-Learning_E3)
+* [RL_Sarsa_E-1.py](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Sarsa_E1)
+* [RL_Sarsa_E-2.py](https://github.com/sichkar-valentyn/Reinforcement_Learning_in_Python/tree/master/RL_Sarsa_E2)
 
 <br/>
 Experimental results (figures and tables on this page):