Added some critically-needed characters

[clsn]

How could you manage without all these crappy letters?

I made some vital characters nobody should be without, like ƿ and ∃...

[jesusmgg]

Hello, I'm maintaining an updated fork of this while we wait to hear news from the original version. If you can you can submit your PRs there, I'll gladly accept them: https://github.com/jesusmgg/comic-shanns-mono

[clsn]

OK, submitted a PR over there.