Merge pull request #12321 from bogdan/time-with-zone-succ

Changelog entry for pr #11474

activesupport/CHANGELOG.md

+*   Disable the ability to iterate over Range of AS::TimeWithZone 
+    due to significant performance issues.
+
+    *Bogdan Gusiev*
+
 *   Allow attaching event subscribers to ActiveSupport::Notifications namespaces
     before they're defined. Essentially, this means instead of this: