Update breaking-changes.md

Author: grofit

docs/breaking-changes.md

@@ -1,5 +1,14 @@
 # Breaking Changes
 
+## 3.8.0 -> 3.9.0
+
+ - `IObservableScheduler` is now known as `IUpdateScheduler` and uses an `ElapsedTime` object not `TimeSpan`
+
+## 3.0.0 -> 3.8.0
+
+- `Group` no longer contains Predicate and has been split into `GroupWithPredicate` object
+- `IObservableScheduler` is now inside `EcsRx` core and not infrastructure
+
 ## 2.0.0 -> 3.0.0
 
 - Some extension methods around groups have been removed
@@ -32,4 +41,4 @@
 ### Entities
 - `IEntity.Id` is no longer a `Guid` and is now an `int`
 - `IEntity.AddComponent<T>` has been removed, but kept as an extension method on `IEntity`
-- Most interactions at entity level are batched, i.e `AddComponent<T>()` is now `AddComponents(params IComponent[] components)`
+- Most interactions at entity level are batched, i.e `AddComponent<T>()` is now `AddComponents(params IComponent[] components)`