convert shebang lines: python -> python3
diff --git a/Tools/unicode/comparecodecs.py b/Tools/unicode/comparecodecs.py
index dade1ce..0f5c1e2 100644
--- a/Tools/unicode/comparecodecs.py
+++ b/Tools/unicode/comparecodecs.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """ Compare the output of two codecs.