convert shebang lines: python -> python3
diff --git a/Demo/scripts/find-uname.py b/Demo/scripts/find-uname.py
index 1902423..b6ec1b6 100755
--- a/Demo/scripts/find-uname.py
+++ b/Demo/scripts/find-uname.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 For each argument on the command line, look for it in the set of all Unicode