convert shebang lines: python -> python3
diff --git a/Tools/scripts/linktree.py b/Tools/scripts/linktree.py
index 748b042..982f480 100755
--- a/Tools/scripts/linktree.py
+++ b/Tools/scripts/linktree.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # linktree
 #