Update XOOPS version to 2.7.0-RC4

Author: mambax7

htdocs/include/version.php

@@ -32,4 +32,4 @@
 /**
  *  Define XOOPS version
  */
-define('XOOPS_VERSION', 'XOOPS 2.7.0-RC1');
+define('XOOPS_VERSION', 'XOOPS 2.7.0-RC4');