convert shebang lines: python -> python3
diff --git a/Demo/cgi/cgi2.py b/Demo/cgi/cgi2.py
index 1d5822c..8aa57b3 100755
--- a/Demo/cgi/cgi2.py
+++ b/Demo/cgi/cgi2.py
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python3
 
 """CGI test 2 - basic use of cgi module."""