Autoloader for the class was missing

So didnt work if was included with Composer autoload

Author: pH-7

composer.json

@@ -15,5 +15,10 @@
     ],
     "require": {
         "php": ">=5.2.4"
-    }
+    },
+    "autoload": {
+         "classmap": [
+             "QRCode.class.php"
+         ]
+     }
 }