img change middleware

$response = $next($request);
		$buffer   = $response->getContent();
		ini_set('zlib.output_compression', 'On'); // If you like to enable GZip, too!

		$buffer = preg_replace('~<img(?!.*data-lazyno)[^>]*\K(?=src)~i', 'data-r', $buffer);
		$response->setContent($buffer);
		$buffer = $response->getContent();

		$buffer = preg_replace('~<iframe(?!.*data-lazyno)[^>]*\K(?=src)~i', 'data-r', $buffer);
		$response->setContent($buffer);
		$buffer = $response->getContent();