convert shebang lines: python -> python3
diff --git a/Demo/sockets/finger.py b/Demo/sockets/finger.py
index e8b9ed2..4d49391 100755
--- a/Demo/sockets/finger.py
+++ b/Demo/sockets/finger.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Python interface to the Internet finger daemon.
 #