Making the python installer work in a Windows environment. (#158)

* Updating setup.py, text encoding flag.

Updating the open() function to include the correct text encoding, otherwise it'll use the default of the OS. 
Using the default text encoding on windows uses cp1252 which creates decoding errors when setup.py runs.

* Forgot to make utf_8 a string.

setup.py

@@ -18,7 +18,7 @@
 import os
 from setuptools import setup
 
-with open("README.md", "r") as fh:
+with open("README.md", "r", encoding="utf_8") as fh:
     long_description = fh.read()