Update readme

README.md

@@ -48,17 +48,20 @@ $qrCode->setSize(300);
 
 // Set advanced options
 $qrCode->setWriterByName('png');
-$qrCode->setMargin(10);
 $qrCode->setEncoding('UTF-8');
 $qrCode->setErrorCorrectionLevel(ErrorCorrectionLevel::HIGH());
 $qrCode->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0]);
 $qrCode->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0]);
 $qrCode->setLabel('Scan the code', 16, __DIR__.'/../assets/fonts/noto_sans.otf', LabelAlignment::CENTER());
 $qrCode->setLogoPath(__DIR__.'/../assets/images/symfony.png');
 $qrCode->setLogoSize(150, 200);
-$qrCode->setRoundBlockSize(true);
 $qrCode->setValidateResult(false);
 
+// Apply a margin and round block sizes to improve readability
+// Please note that rounding block sizes can result in additional margin
+$qrCode->setRoundBlockSize(true);
+$qrCode->setMargin(10); 
+
 // Set additional writer options (SvgWriter example)
 $qrCode->setWriterOptions(['exclude_xml_declaration' => true]);