convert shebang lines: python -> python3
diff --git a/Tools/scripts/md5sum.py b/Tools/scripts/md5sum.py
index 140c0b3..743da72 100644
--- a/Tools/scripts/md5sum.py
+++ b/Tools/scripts/md5sum.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 """Python utility to print MD5 checksums of argument files.
 """