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feat: support validate against error constructor (#89)


You can now use the `throws()` assertion like this:

```ts
import a from 'assertron'

class MyError extends Error {
  constructor(msg) {
    super(msg)
    Object.setPrototypeOf(this, new.target.prototype)
  }
}

a.throws(Promise.reject(new MyError('x')), MyError)
```

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