python: Use python3 explicitly in setup.py

diff --git a/python/setup.py b/python/setup.py
index cecda45..e5c82d5 100755 (executable)
--- a/python/setup.py
+++ b/python/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 from distutils.core import setup, Extension