Reorganize changelog

Author: ahangarha

CHANGELOG.md

@@ -8,14 +8,16 @@ If you need help upgrading `react-rails`, `webpacker` to `shakapacker`, or JS pa
 Changes since last non-beta release.
 
 _Please add entries here for your pull requests that are not yet released._
-- Add option to replace `null`s in props with `undefined` via `ReactRailsUJS.setOptions` #1273
 
 ### Breaking Changes
 - Requires separate compilations for server & client bundles if using Shakapacker (see [Webpack config](https://github.com/reactjs/react-rails/tree/master/test/dummy/config/webpack)) #1274
 - Replaces WebpackManifestContainer, which searched for assets in the webpack manifest, with SeparateServerBundleContainer, which expects a single server bundle file & does not use the webpack manifest at all. #1274
 - Upgrades React-Rails' embedded react to v18.2.0. Uses node polyfill plugin & fast-text-encoder for SSR text encoding. #1290
 - If using Webpacker/Shakapacker, requires upgrading to Shakapacker v7 #1274 and #1285
 
+#### Added
+- Added option to replace `null`s in props with `undefined` via `ReactRailsUJS.setOptions` #1273
+
 #### Changed
 - The `react:component` generator now generates a function component by default #1271