Add changelog notes for TinyMCE 7 upgrade.

Author: Benjamin Moody

CHANGELOG.rst

@@ -6,9 +6,11 @@ This document describes changes between each past release.
 5.0.0 (unreleased)
 ==================
 
+- Upgrade embedded TinyMCE from 6.8.4 to 7.8.0.
 - Drop support for Django 3.2.
 - Add support for Django 5.1 and 5.2.
 - Drop support for Python 3.8 and add support for Python 3.13.
+- The ``template`` plugin has been removed in TinyMCE 7.
 
 4.0.1 (2024-06-21)
 ==================