Update CHANGELOG

Author: zonuexe

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes of the PHP Mode 1.19.1 release series are documented in this
 
 ## Unreleased
 
+### Added
+
+ * **Experimental feature: `php-ide`**
+   * Add `php-ide-phpactor` as simple IDE feature without LSP clients
+   * Add `php-ide-mode` minor mode for binding IDE-like features
+
 ### Removed
 
  * No longer highlights `'link` in PHPDoc ([#724])