. updateConfig needs to preserve the special character replacements
-- you've previously defined. Hint: appendFile?

-- If you like, you can print out a friendly message saying what you're doing,
-- based on the function called.

{-- BONUS -----------------------------------------------------------------

With the updated config file, you should now be clear to replace the special
characters in the archive. Repeat all the steps above. Does it do a replace
of the special characters in your archive?

Let's find out.

In the updated archive, are there any special characters? List them.

Hint: Y2017.M10.D30.Exercise.identify

Also: write an application that does all the above.
--}

main' :: [String] -> IO ()
main' (configfile:archivefiles) = undefined -- do
main' :: [String] -> IO ()
main' (configfile:archivefiles) = undefined
main' (configfile:archivefiles) = undefined