improvement for phpcompability

Author: Mte90

codeat.xml

@@ -7,6 +7,8 @@
 
 	<!-- https://github.com/wimg/PHPCompatibility/ -->
 	<rule ref="PHPCompatibility"/>
+        <!-- Check for cross-version support for PHP 5.6 and higher. -->
+        <config name="testVersion" value="5.2-"/>
 
 	<rule ref="WordPress">
 		<exclude name="Generic.Files.LineEndings.InvalidEOLChar" />