Prevent versioning of WordPress CSS/JS

functions.php

<?php 

function remove_cssjs_ver( $src ) {
	if( strpos( $src, '?ver=' ) )
		$src = remove_query_arg( 'ver', $src );
	return $src;
}
add_filter( 'style_loader_src', 'remove_cssjs_ver', 1000 );
add_filter( 'script_loader_src', 'remove_cssjs_ver', 1000 );