Made migrating to v0.3 more prominent

README.md

 ## Documentation and References
 
 **For more information, in addition to installation and usage
-instructions, see our [documentation home](docs/README.md).**
+instructions, see our [documentation home](docs/README.md).** If you have
+used a version of ML-Agents prior to v0.3, we strongly recommend 
+our [guide on migrating to v0.3](docs/Migrating-v0.3.md).
 
 We have also published a series of blog posts that are relevant for ML-Agents:
 - Overviewing reinforcement learning concepts

docs/Readme.md

  * [Using TensorBoard to Observe Training](Using-Tensorboard.md)
 
 ## Help
+ * [Migrating to ML-Agents v0.3](Migrating-v0.3.md)
- * [Migrating to ML-Agents v0.3](Migrating-v0.3.md)
  
 ## C# API and Components
  * Academy