Update README.md

Author: YangRui2015

README.md

@@ -1,6 +1,6 @@
-# Gym 2048 Environment  
+# Gym 2048 Environment for Reinforcement Learning
 
-Thanks to the author of gym-2048 https://github.com/rgal/gym-2048. The code is easy to understand and runs efficiently. I just made some little changes for a better agent training environment.
+Thanks to the author of gym-2048 https://github.com/rgal/gym-2048. The code is easy to understand and runs efficiently. I just made some little changes for a better RL environment.
 
 
 ## Performance of environment