Update setup.py

Author: wannaphong

setup.py

@@ -11,7 +11,7 @@
 
 setup(
     name='pypromptpay',
-    version='0.5',
+    version='0.5.1',
     description="PromptPay QR code in Python",
     author='Wannaphong Phatthiyaphaibun',
     long_description=readme,