Merge pull request picqer#5 from amenk/patch-1

Readme: Namespace correction

Author: casperbakker

Readme.md

@@ -71,6 +71,6 @@ $generatorHTML = new Picqer\Barcode\BarcodeGeneratorHTML();
 Embedded PNG image in HTML:
 
 ```php
-$generator = new Picqer\Barcode\BarcodeGeneratorPNG();
+$generator = new \Picqer\Barcode\BarcodeGeneratorPNG();
 echo '<img src="data:image/png;base64,' . base64_encode($generator->getBarcode('081231723897', $generator::TYPE_CODE_128)) . '">';
 ```