No tagged release with typo fix

[geekish]

I had to change the version constraint in my project's composer.json from ^2.0 to dev-master in order to use this library because of the typo fixed in #13.

It would be lovely if you could tag a release, as I prefer not to use dev-master if I don't have to. :)

[hansott]

Bump

[paragonie-scott]

Somehow, the email notifications for this repo aren't showing up in the usual place. I'll have to check my filters.

https://github.com/paragonie/anti-csrf/releases/tag/v2.0.1