title: i can not use my proxy with http:username:password@host:port
body: <p><strong>Im getting this error while using custom proxy url... in the above formate..  My proxy does not support http:// format</strong> <strong>adding http:// gives authentication error 407</strong><br />
  RequestError: connect ENOENT username:pass@host:5959
  at ClientRequest. (C:\Users\Force\pupp\my-new-project\node_modules\got\dist\source\core\index.js:953:111)
  at Object.onceWrapper (events.js:422:26)
  at ClientRequest.emit (events.js:327:22)
  at ClientRequest.origin.emit (C:\Users\Force\pupp\my-new-project\node_modules@szmarczak\http-timer\dist\source\index.js:39:20)
  at onerror (C:\Users\Force\pupp\my-new-project\node_modules\agent-base\dist\src\index.js:117:21)
  at callbackError (C:\Users\Force\pupp\my-new-project\node_modules\agent-base\dist\src\index.js:136:17)
  at runMicrotasks ()
  at processTicksAndRejections (internal/process/task_queues.js:97:5)
  at PipeConnectWrap.afterConnect [as oncomplete] (net.js:1141:16)</p>