`sized-vectors` vs `fast-vect`

Since the latest major release, PureScript now has typelevel Integers. This makes the approach used in this library obsolete.

I am not sure if it makes sense to update to the new type level integers because there's now [fast-vect](https://github.com/sigma-andex/purescript-fast-vect) from @sigma-andex that already does that.

So my questions are:

- Is there still anything that one would chose `sized-vectors` in favor of `fast-vect`?
- If not, should we maybe add a deprecation note and refer to `fast-vect`?

What do you think?