In order to do this, I had to remove the very old and unmaintainted
`otplib` and replace it with the well-maintained
[otpauth](https://www.npmjs.com/package/otpauth).
I kept the parameters the same, but if there is something only slightly
off between the two libraries, this could cause a major headache. I am
unsure on how to test this though, or if we can provide some sort of
migration for this.
The reason for the upgrade is two-fold:
1. As I said, the original library was unmaintained
2. It's verification mechanism relied on a Buffer class that, as far as
I can tell, can't work without some `require` statements that are
missing from the library's source files.
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