add clippy

[Patrick-W-McMahon]

it would be great to have a Clippy added as one of the options.

[piuccio]

You can use any clipart you like, the option cow can be one of the included ones or any other file. Check the files in cows for the format

[jasonkhanlar]

I am using Archlinux, and I see a few extra .cow files not in this repo, which also are not listed in https://web.archive.org/web/20140627210540/https://www.nog.net/~tony/warez/

https://github.com/piuccio/cowsay/tree/master/cows has a few extra
https://github.com/tnalpgge/rank-amateur-cowsay/tree/master/cows has a few extra (I was looking for blowfish)
https://github.com/bkendzior/cowfiles has a few extra
Also see:
https://github.com/sasairc/clangsay/tree/master/cows/asciiart
https://github.com/sasairc/clangsay/tree/master/cows/pixelart
https://github.com/paulkaefer/cowsay-files/tree/master/cows

Not exactly .cow files, but can be converted:
https://github.com/audy/catsay/tree/master/cats

I'll see about submitting a pull request maybe, but first I thought I'd share a list of repos with few extra cowfiles that might be worth considering to include or share to others.

Ah, just as a note (for myself), I see one .cow file has a line:
$eyes = ".." unless ($eyes);