fix silly typos in help message
@@ -966,7 +966,7 @@ Written by Gary V. Vaughan <gary@gnu.org>, 2014
Copyright (C) 2016, Gary V. Vaughan
Luke comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of Luke under the terms of the MIT license;
-it may be used for any porpose at absolutely no cose, without permission.
+it may be used for any purpose at absolutely no cost, without permission.
See <https://mit-license.org> for details.
]]
exit(0)
