convert shebang lines: python -> python3
diff --git a/Tools/scripts/methfix.py b/Tools/scripts/methfix.py
index f5fe7cd..030e1c9 100755
--- a/Tools/scripts/methfix.py
+++ b/Tools/scripts/methfix.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Fix Python source files to avoid using
 #       def method(self, (arg1, ..., argn)):