Will be nice to clear auth credentials. For example, I'm using a proxy that accepts options via username:

```
proxy.com:8080
user: wiliam_country_US
```

So, if I want to change the peer node, I change my username:

```
proxy.com:8080
user: wiliam_country_GB
```

But, I'm not changing the proxy, so electron has valid credentials and is not going to trigger `login` event.

I'm searching the way to clean auth settings so electron asks them again.
atom/browser/api/atom_api_url_request.cc
v8::Local<v8::FunctionTemplate> prototype) {
  prototype->SetClassName(mate::StringToV8(isolate, "URLRequest"));
  mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
      
      .MakeDestroyable()
      .SetMethod("write", &URLRequest::Write)
      .SetMethod("cancel", &URLRequest::Cancel)
      .SetMethod("setExtraHeader", &URLRequest::SetExtraHeader)
      .SetMethod("removeExtraHeader", &URLRequest::RemoveExtraHeader)
      .SetMethod("setChunkedUpload", &URLRequest::SetChunkedUpload)
      .SetProperty("notStarted", &URLRequest::NotStarted)
      .SetProperty("finished", &URLRequest::Finished)
      
      .SetProperty("statusCode", &URLRequest::StatusCode)
      .SetProperty("statusMessage", &URLRequest::StatusMessage)
      .SetProperty("rawResponseHeaders", &URLRequest::RawResponseHeaders)
      .SetProperty("httpVersionMajor", &URLRequest::ResponseHttpVersionMajor)
      .SetProperty("httpVersionMinor", &URLRequest::ResponseHttpVersionMinor);
}
bool URLRequest::NotStarted() const {