Fix TypeError in setuputils.

The codecs.open function always return bytes object.

setuputils.py

@@ -5,7 +5,7 @@ import re
 
 def read(*parts):
     file_path = os.path.join(os.path.dirname(__file__), *parts)
-    return codecs.open(file_path).read()
+    return codecs.open(file_path, 'r').read()
 
 
 def find_version(*parts):
@@ -15,4 +15,3 @@ def find_version(*parts):
     if version_match:
         return version_match.group(1)
     raise RuntimeError('Unable to find version string.')
-