fix: simplify error class checking (#53)

Previously, we were unnecessarily trying to determine if the passed
object was in fact a class which extends `Error`.

We don't actually care about this, really. We just want to know if the
`thrown` is an instance of the thing you passed.

Due to this, we can simplify by simply checking that the `errorLike` is
something with a `prototype` and assert that the `thrown` is an instance
of it.

feat: support virtual contexts (#50)

This adds support for virtual contexts by testing `RegExp` and `Error`
via `toString` instead of an `instanceof` check.

1.0.3

Use web test runner instead of karma (#46)

* convert package-lock.json to version 3

* use web-test-runner instead of karma

* actually install web test runner

* set node version to 16

Merge pull request #8 from lucasfcosta/readme-require-and-formatting-…

…fixes

fix: readme unformatted node link and require for check-error

Merge pull request #6 from lucasfcosta/fix-anonymous-functions-ie

fix: tests for anonymous functions on IE

Merge pull request #4 from lucasfcosta/fix-ie-function-name

fix: Function.name failing IE tests