update changelog

[skip ci]

Author: scambra

CHANGELOG.rdoc

@@ -22,6 +22,7 @@
 - Use clear_storage with around_action and ensure, so empty hash is removed from session storage when exception is raised too
 - Delete search from session when search is reset
 - Add cache_column_counts method to get counts with one query for associations which are not preloaded, query per column is overridable with count_query_for_column
+- ActiveStorage support with bridge
 
 = 3.6.0.pre
 - Added threadsafety as tech preview, enabled with ActiveScaffold.threadsafe! in initializer.