message: set value of qrcode to proper value stated in docs
diff: @@ -61,7 +61,7 @@ export namespace OutputBarcode {
  Ean13 = <any> 'EAN13',
  Ean8 = <any> 'EAN8',
  Pdf417 = <any> 'PDF417',
  - Qrcode = <any> 'QRCODE',
  + Qrcode = <any> 'QRCode',
  Upca = <any> 'UPCA'
  }
  }
  