Update CHANGELOG.md

Author: AB-xdev

CHANGELOG.md

@@ -1,5 +1,8 @@
 # 1.0.0
 <i>Initial release</i>
+* All methods and functionality are designed to be overwritable (at least protected)
 * The library consists of 2 main parts:
   * ``extendable`` → Includes the bare minimum to make the Spring components extendable
-  * ``advanced`` → Contains components made on top of ``extendable`` with many customization options 
+  * ``advanced`` → Contains components made on top of ``extendable`` with many customization options; Additionally:
+    * Updated Bootstrap to version 5.3+
+    * Improved SSO (OAuth2 / SAML2) UI