scripts: Tie Python 2 -> 3 conversion loose ends.
diff --git a/scripts/snapdiff.py b/scripts/snapdiff.py
index 7e92fe7..4207443 100755
--- a/scripts/snapdiff.py
+++ b/scripts/snapdiff.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 ##########################################################################
 #
 # Copyright 2011 Jose Fonseca