docs(readme.md): spelling fix "oon" to "on"

[mikeumus]

I can haz contribution? :D

[jonboulle]

Thanks for the fix! Would you mind rewording your commit message to follow the contribution guidelines?

[mikeumus]

@jonboulle, sure thing! Kinda rushed it a little at first. 😄

[mikeumus]

@jonboulle is that right now?

[jonboulle]

@mikeumus actually it's the commit message itself I was talking about; you can rewrite it with git rebase, and then git push --force onto your branch to replace the one here.

[mikeumus]

@jonboulle, check it out. 😺 👍
Did I get it ❓

[jonboulle]

Perfect, thanks again!

[mikeumus]

Woo hoo! Thanks for the lesson in Contribution Guidelines. Got it ready now.