Final release that supports python < 3.6

Author: Landon Gilbert-Bland

setup.py

@@ -37,6 +37,7 @@
       extras_require={
         'asymmetric_crypto':  ["cryptography >= 2.3"]
       },
+      python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4',
       classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Web Environment',