Release notes

RELEASENOTES.md

@@ -1,12 +1,14 @@
 ## Joomla and PHP Compatibility
 
 We are developing, testing and using Akeeba Contact Us using the latest version of Joomla! and a popular and actively maintained branch of PHP 7. At the time of this writing this is:
-* Joomla! 3.6
-* PHP 7.0
+* Joomla! 3.8
+* PHP 7.2
 
 Akeeba Contact Us should be compatible with:
 * Joomla! 3.4, 3.5, 3.6, 3.7, 3.8
 * PHP 5.4, 5.5, 5.6, 7.0, 7.1, 7.2
 
 ## Changelog
 
+* License change to GPLv3 or later.
+* Converted interface to use Akeeba Frontend Framework (FEF).