Fix python version

Author: avara1986

setup.py

@@ -33,7 +33,7 @@
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6"
     ],
-    python_requires='>=3.6',
+    python_requires='>=3.5',
     license="GPLv3",
     platforms=["any"],
     keywords="python, microservices",