[release] Add release notes for 2.8.2

https://github.com/dart-lang/sdk/issues/41816

Change-Id: I34b6b3febfd00760b3ea75f0f68305a791be2c1c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/147481
Reviewed-by: Michael Thomsen <mit@google.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90d3ea8..3cc8926 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## 2.8.2 - 2020-05-13
+
+This is a patch release that fixes an AOT compilation bug in global
+transformations which manifests as a NoSuchMethod exception
+(issue [flutter/flutter#56479][]).
+
+[flutter/flutter#56479]: https://github.com/flutter/flutter/issues/56479
+
 ## 2.8.1 - 2020-05-06
 
 Much of the changes in this release are in preparation for non-nullable types,