Set Python requirements

Author: mdmintz

setup.py

@@ -100,6 +100,7 @@
         "Topic :: Software Development :: Testing :: Traffic Generation",
         "Topic :: Utilities",
     ],
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
     install_requires=[
         'pip>=20.2.3',
         'packaging>=20.4',