Proxy support

[kasmkbg]

Hi 👋
we have to run behind a proxy.
In got it is very easy to set a proxy agent. Unfortunately got4aws does not give the option to change some got settings.
What do you think about something along the following lines?

const client = got4aws({
      service: 'execute-api',
      region: 'eu-west-1',
      gotOptions: {
        agent: {https: proxyAgent}
      }
    });