Remove python 3.6.x installation blocker

Author: jhodges10

setup.py

@@ -25,7 +25,7 @@ def run(self):
 setuptools.setup(
   name='frameioclient',
   version=version,
-  python_requires='>=2.7.17, !=3.6.*, <4',
+  python_requires='>=2.7.17, <4',
   install_requires=[
     'requests',
     'urllib3',