Updating the release version

Author: karen-avetisyan-mc

client_encryption/version.py

@@ -1,3 +1,3 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-__version__ = "1.9.0"
+__version__ = "1.20.0"

setup.py

@@ -3,7 +3,7 @@
 exec(open('client_encryption/version.py').read())
 
 setup(name='mastercard-client-encryption',
-      python_requires='>=3.5.4',
+      python_requires='>=3.8',
       version=__version__,
       description='Mastercard Client encryption.',
       long_description='Library for Mastercard API compliant payload encryption/decryption.',