Add support for es6 default import

[CaselIT]

I was wondering if it would be possible to add module.exports.default = auth; to add support to the default es6 style import import auth from "basic-auth"

Thanks

[blakeembrey]

For background, see typed-typings/npm-basic-auth#1 and typings/discussions#32. Deferring to @dougwilson's opinion as mine has been stated elsewhere, but I can elaborate if needed.

[CaselIT]

After further discussion with @blakeembrey (in typed-typings/npm-basic-auth#1) I came to the conclusion that while useful, still to many variables on the implementation of es6 in nodejs are left open, that could require the removal of the default export.