Remove unnecessary new line added in #3652 (#3663)

Author: Marwan Mattar

README.md

@@ -46,7 +46,6 @@ developer communities.
 ## Releases & Documentation
 **Our latest, stable release is 0.15.0. Click
 [here](https://github.com/Unity-Technologies/ml-agents/tree/latest_release/docs/Readme.md) to
-
 get started with the latest release of ML-Agents.**
 
 The table below lists all our releases, including our `master` branch which is under active