Update README, remove obsolete scripts.
diff --git a/Tools/scripts/byext.py b/Tools/scripts/byext.py
index e5b090c..71e4ba1 100755
--- a/Tools/scripts/byext.py
+++ b/Tools/scripts/byext.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python3.0
+#! /usr/bin/env python3
 
 """Show file statistics by extension."""