Update README.md

Author: YangRui2015

README.md

@@ -6,14 +6,14 @@ Thanks to the author of gym-2048 https://github.com/rgal/gym-2048. The code is e
 ## Performance of environment
 I used random policy to evaluate the performance for 1000 times. We can take random policy as a baseline.
 
-with render:  
+(1)with render:  
 average episode time:0.10279795455932617 s;  
 average step time: 0.7373 ms；  
 average highest score:106.368;  
 average total score:1078.252;  
 average steps:139.417;  
 
-without render:  
+(2)without render:  
 average episode time:0.03773710775375366 s;  
 average step time: 0.2671 ms；  
 average highest score:108.24;