revert changes to read long_description

Author: emmanvg

setup.py

@@ -3,7 +3,7 @@
 # Copyright (c) 2018 - The MITRE Corporation
 # For license information, see the LICENSE.txt file
 
-
+from io import open  # Allow `encoding` kwarg on Python 2.7
 from os.path import abspath, dirname, join
 
 
@@ -23,7 +23,7 @@ def get_version():
 
 
 def get_long_description():
-    with open('README.rst') as f:
+    with open('README.rst', encoding='utf-8') as f:
         return f.read()