Fix open mode in setupegg.py wrapper script

setupegg.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
 """Wrapper to run setup.py using setuptools."""
 import setuptools
-with open('setup.py', 'rb') as f:
+with open('setup.py') as f:
     exec(compile(f.read(), 'setup.py', 'exec'))