Bump to version 3.6 to ensure support for all type hinding (including local variables).

vol.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.6
 
 import volatility.cli
 

volatility/framework/__init__.py

@@ -102,6 +102,6 @@ def import_files(base_module):
 
 
 # Check the python version to ensure it's suitable
-required_python_version = (3, 4)
+required_python_version = (3, 6)
 if sys.version_info.major != required_python_version[0] or sys.version_info.minor < required_python_version[1]:
     raise RuntimeError("Volatility framework requires python version {}.{} or greater".format(*required_python_version))