Does not accept WHATWG URL

[JonathanWilbur]

This library does not accept WHATWG URLs. See this bug, which I have written up for one of this library's dependencies: TooTallNate/node-agent-base#26. An additional bug writeup that may be instructive is nodejs/node#26198.

You will also have this same issue with this line of code in this package:

  var proxy = Object.assign({}, opts);

[sadasant]

@JonathanWilbur what do you think of this approach? #71

[TooTallNate]

This module has gone through a large refactor and modernization. I am closing this issue as a bit of house cleaning. If you feel that this issue still exists in the latest release, feel free to open a new issue.