Update phpcs.xml to scan JS files

Co-Authored-By: Thrijith Thankachan <[email protected]>

Author: chandrapatel

phpcs.xml

@@ -14,7 +14,7 @@
 	<arg name="parallel" value="8"/>
 
 	<!-- Only check the PHP files. JS files are checked separately with JSCS and JSHint. -->
-	<arg name="extensions" value="php"/>
+	<arg name="extensions" value="php,js"/>
 
 	<!-- Check all files in this directory and the directories below it. -->
 	<file>.</file>