📝 Update CHANGELOG.md

Author: MaySoMusician

CHANGELOG.md

@@ -29,6 +29,9 @@ _Please add entries here for your pull requests that are not yet released._
 - Include turbolinks in dev and update webdrivers #1174
 - Add support for multiple `require.context` with addition of `useContexts` #1144
 - Update many dependencies
+- Add option to replace `null`s in props with `undefined` via `ReactRailsUJS.setOptions` #1273
+
+#### Deprecation
 
 #### Bug Fixes
 - Fix installation crash caused by absolute path for `source_entry_path` in default `config/webpacker.yml` coming from `shakapacker` version 6.x - #1216