convert shebang lines: python -> python3
diff --git a/Lib/test/test_marshal.py b/Lib/test/test_marshal.py
index 6688785..9de0165 100644
--- a/Lib/test/test_marshal.py
+++ b/Lib/test/test_marshal.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from test import support
 import marshal