Use Zlib license.

README

@@ -1,13 +1,10 @@
 ==========
 *** d6 ***
 ==========
+
 A diceware password generator written in Bash. I believe I've written
 one before, also called 'd6', but I can't find it anywhere, so I wrote a
 new one. I'm too lazy to write a real README for this, so just use the
 `-h` option. To install it just run the `install` command, which is all
 any Makefile really does anyway. Don't know how to use it? Use the
 manual page.
-
-This project is licensed with the Unlicense, because it's literally just
-something I whipped up in less than an hour. Feel free to use it however
-you want, just remember that it comes without warranty of any kind.