Update heading of migration guide.

Chris Elion · web-flow · commit b9100d9640c6 · 2019-11-27T16:22:15.000-08:00
diff --git a/docs/Migrating.md b/docs/Migrating.md
@@ -1,6 +1,6 @@
 # Migrating
 
-## Migrating from ML-Agents toolkit v0.11.0
+## Migrating from ML-Agents toolkit v0.11.0 to v0.12.0
 
 ### Important Changes
 * Text actions and observations, and custom action and observation protos have been removed.
