CHANGELOG for invariant generic bounds

Change-Id: If7dcc07b9fb68e149814e8de42bbf6d9d0425a62
Reviewed-on: https://dart-review.googlesource.com/56621
Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fdd6cd..93ad3a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,23 @@
 
 ### Language
 
+The change to make bounds on generic functions invariant has landed in the
+analyzer.  The analyzer will now issue an invalid override error on the
+following program ([issue 29014][sdk#29014]).
+
+```dart
+class A {
+  void f<T extends int>() {}
+}
+
+class B extends A {
+  @override
+  void f<T extends num>() {}
+}
+```
+
+[sdk#29014]: https://github.com/dart-lang/sdk/issues/29014
+
 #### Strong Mode
 
 ### Core library changes