Added io.open in heat_capacity for python3 win64 compatibility

Author: CalebBell

setup.py

@@ -51,7 +51,7 @@
   name = 'thermo',
   packages = ['thermo'],
   license='MIT',
-  version = '0.1.12',
+  version = '0.1.13',
   description = 'Chemical properties component of Chemical Engineering Design Library (ChEDL)',
   author = 'Caleb Bell',
   install_requires=['fluids', 'scipy', 'pandas', 'matplotlib', 'coolprop'],
@@ -62,7 +62,7 @@
   platforms=["Windows", "Linux", "Mac OS", "Unix"],
   author_email = 'Caleb.Andrew.Bell@gmail.com',
   url = 'https://github.com/CalebBell/thermo',
-  download_url = 'https://github.com/CalebBell/thermo/tarball/0.1.12',
+  download_url = 'https://github.com/CalebBell/thermo/tarball/0.1.13',
   keywords = ['chemical engineering', 'chemistry', 'mechanical engineering', 
   'thermodynamics', 'databases', 'cheminformatics'],
   classifiers = classifiers,

thermo/heat_capacity.py

@@ -22,6 +22,7 @@
 
 from __future__ import division
 import os
+from io import open
 from math import log, exp
 import numpy as np
 import pandas as pd
@@ -696,7 +697,7 @@ def _append2dict(maindict, newdict):
     return data
 
 
-with open(os.path.join(folder, 'Zabransky.csv')) as f:
+with open(os.path.join(folder, 'Zabransky.csv'), encoding='utf-8') as f:
     next(f)
     for line in f:
         values = to_num(line.strip('\n').split('\t'))