adjust import order and fix `qr` method

escpos/escpos.py

@@ -6,9 +6,9 @@
 @license: GPL
 '''
 
-import qrcode
-import time
 import os
+import time
+import qrcode
 import operator
 from PIL import Image
 
@@ -147,9 +147,9 @@ class Escpos:
         qr_code.add_data(text)
         qr_code.make(fit=True)
         qr_img = qr_code.make_image()
-        im = qr_img._img.convert("RGB")
         # Convert the RGB image in printable image
-        self._convert_image(im)
+        im = qr_img._img.convert("RGB")
+        self.image(im)
 
     def barcode(self, code, bc, width, height, pos, font):
         """ Print Barcode """