fix barcode image example

Author: willamowius

test.py

@@ -47,7 +47,7 @@
 print(ean + " was issued in " + country)
 
 barcode = eansearch.barcodeImage("5099750442227", 300, 200)
-print("HTML: <img src=\"data:image/png;base64," + " encoded + "\">")
+print("HTML: <img src=\"data:image/png;base64," + barcode + "\">")
 
 #import base64
 #print (base64.b64decode(barcode))