Update README.md

Author: MathiasGruber

README.md

@@ -24,6 +24,7 @@ The environment is considered solved, when the average (over 100 episodes) of th
 
 # Getting the environment
 Download the environment from one of the links below.  You need only select the environment that matches your operating system:
+
     - Linux: [click here](https://s3-us-west-1.amazonaws.com/udacity-drlnd/P3/Tennis/Tennis_Linux.zip)
     - Mac OSX: [click here](https://s3-us-west-1.amazonaws.com/udacity-drlnd/P3/Tennis/Tennis.app.zip)
     - Windows (32-bit): [click here](https://s3-us-west-1.amazonaws.com/udacity-drlnd/P3/Tennis/Tennis_Windows_x86.zip)