Inaccurate link to docs for error thrown

```
  Try wrapping the first argument to `t.throws()` in a function:

    t.throws(() => { /* your code here */ })

  Visit the following URL for more details:

    https://github.com/avajs/ava/blob/v1.0.1/readme.md#throwsthrower-expected-message
```

This link does not work: <https://github.com/avajs/ava/blob/v1.0.1/readme.md#throwsthrower-expected-message>