Allow redemo.py to be used from the command line like other demos.

diff --git a/Tools/demo/redemo.py b/Tools/demo/redemo.py
old mode 100644 (file)
new mode 100755 (executable)
index 5286332..b10b030
--- a/Tools/demo/redemo.py
+++ b/Tools/demo/redemo.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 """Basic regular expression demostration facility (Perl style syntax)."""
 
 from tkinter import *