Add duplicate shown/hidden name analyzer note to changelog

Bug: none
Change-Id: I92f57407b4eb657a0e03cde1e9e6abb2bcc8ac07
Reviewed-on: https://dart-review.googlesource.com/57640
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40f9ed5..a353d32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,13 @@
 
 ### Tool Changes
 
+#### Analyzer
+
+* New static checking of duplicate shown or hidden names in an export directive
+  ([issue 33182]).
+
+[issue 33182]: https://github.com/dart-lang/sdk/issues/33182
+
 #### Pub
 
 #### Other Tools