Update README.md

Author: pythonlessons

README.md

@@ -24,6 +24,7 @@ PPO and PPO_CNN agents playing Pong-v0 game:<br>
 
 10. [Introduction to RL Asynchronous Advanced Actor Critic algorythm (A3C)](https://pylessons.com/A3C-reinforcement-learning/)
 
-11. [Introduction to RL Proximal Policy Optimization algorythm (PPO)](https://pylessons.com/PPO-reinforcement-learning/)<br>
+11. [Introduction to RL Proximal Policy Optimization algorythm (PPO)](https://pylessons.com/PPO-reinforcement-learning/)
+<br><br>
 PPO Pong-v0 Learning curve:
 <img src="11_Pong-v0_PPO/Pong-v0_APPO_0.0001_RMSprop.png" data-canonical-src="11_Pong-v0_PPO/Pong-v0_APPO_0.0001_RMSprop.png" width="500" height="300" />