Change 6.0 Beta label to RC label

Author: lcharette

app/config/default.php

@@ -49,7 +49,7 @@
         ],
         'versions' => [
             'available' => [
-                '6.0' => '6.0 Beta',
+                '6.0' => '6.0 RC',
                 '5.1' => '5.1',
                 '5.0' => '5.0',
                 '4.6' => '4.6',