mark pod.py as running on python2

diff --git a/pod.py b/pod.py
index 58bd1f5..0774e47 100755 (executable)
--- a/pod.py
+++ b/pod.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python2
 #
 # Marc E. Fiuczynski <mef@cs.princeton.edu>
 # Copyright (C) 2004 The Trustees of Princeton University