fixed Imagick example (#258)

Author: codemasher

examples/imagickWithLogo.php

@@ -46,7 +46,7 @@ public function dump(string $file = null):string{
 		$imLogo->resizeImage($size, $size, Imagick::FILTER_LANCZOS, 0.85, true);
 
 		// add the logo to the qrcode
-		$this->imagick->compositeImage($imLogo, Imagick::COMPOSITE_ATOP, $pos, $pos);
+		$this->imagick->compositeImage($imLogo, Imagick::COMPOSITE_BLEND, $pos, $pos);
 
 		// output (retain functionality of the parent class)
 		$imageData = $this->imagick->getImageBlob();