Suggested Setup in README Doesn't Work

When I dial this into the latest browserify:

```
var bundle = browserify({
require : { http : 'http-browserify' }
});
```

I get an error saying `Error: path must be a string.`

Please update with correct configuration instructions!

Start by checking the README section containing the suggested Browserify setup and compare it with the latest Browserify configuration behavior. Reproduce the reported “path must be a string” error, then update the instructions with working configuration and verify that the example runs without that error.

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