Fix - Python2.7 specific fix for setup.py

open() can't take an encoding parameter in 2.7

setup.py

@@ -20,7 +20,7 @@ def add_package(package_list, package):
 
 
 this_directory = path.abspath(path.dirname(__file__))
-with open(path.join(this_directory, 'readme.md'), encoding='utf-8') as f:
+with open(path.join(this_directory, 'readme.md')) as f:
     long_description = f.read()
 
 with open("requirements.txt", "r") as fh: