Add deprecation warning and update version

Author: AaronAtDuo

duo_web/__init__.py

@@ -9,6 +9,9 @@
 import hashlib
 import hmac
 import time
+import warnings
+
+warnings.warn("deprecated", DeprecationWarning)
 
 DUO_PREFIX = 'TX'
 APP_PREFIX = 'APP'

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name='duo_web',
-    version='1.3.0',
+    version='1.3.1',
     description='Duo Web SDK for two-factor authentication',
     author='Duo Security, Inc.',
     author_email='support@duosecurity.com',