Just add this function to your functions.php. It will remove the version from all enqueued js and css files.
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', 999 );
add_filter( 'script_loader_src', 'remove_cssjs_ver', 999 );