Update README.md

Author: cjddmut

README.md

@@ -56,7 +56,7 @@ public void SendEvents()
 
 ```
 
-## NOTE!
+## UNMANAGED NOTE!
 Unity Events 2.0 requires that events are [unmanaged](https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/generics/constraints-on-type-parameters) types. This is done to allow better compatibility with the burst compiler when using jobs on events and to encourage "better" programming practices since the events are deferred. References may become stale and GameObjects may have been destroyed and are "null" by the time the event is processed. Send the data the event represents rather than a reference to an object. If a reference is needed then create a look up database and send the id of the object for event listeners to look up to process on. If an array/list is needed then consider using something like [ValueTypeLists](https://gist.github.com/cjddmut/cb43af3ee191af78363f41a3188c0f7b).
 
 ## Dropped Features