convert shebang lines: python -> python3
diff --git a/Demo/cgi/cgi1.py b/Demo/cgi/cgi1.py
index 842fef2..b4154df 100755
--- a/Demo/cgi/cgi1.py
+++ b/Demo/cgi/cgi1.py
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python3
 
 """CGI test 1 - check server setup."""