update readme with 2.0

README.md

-# Animal-AI 2.0.0 (beta)
+# Animal-AI 2.0.0
 
 <p align="center">
   <img height="300" src="documentation/PrefabsPictures/steampunkFOURcrop.png">
@@ -134,6 +134,10 @@ Deshraj Yadav, Rishabh Jain, Harsh Agrawal, Prithvijit Chattopadhyay, Taranjeet
 
 ## Version History
 
+-v2.0.0:
+    - fix small bugs
+    - adds tutorial notebooks
+
 - v2.0.0b0 (beta)
     - Bump ml-agents from 0.7 to 0.15 which:
         - allows multiple parallel environments for training