misc(package): scripts don't require "--" for options to be forwarded

[paulirish]

This isn't required in Yarn 1.0+ or NPM.

And now we kill off this warning:

[wardpeet]

i'm pretty sure npm still needs it but we aren't using it in our scripts so we can just ship this

$ npm start http://m.nieuwsblad.be/ --view
> lighthouse@2.8.0 start /mnt/c/Users/WardPeeters/Projects/os/lighthouse
> node ./lighthouse-cli/index.js "http://m.nieuwsblad.be/"

$ npm start http://m.nieuwsblad.be/ -- --view

> lighthouse@2.8.0 start /mnt/c/Users/WardPeeters/Projects/os/lighthouse
> node ./lighthouse-cli/index.js "http://m.nieuwsblad.be/" "--view"

[wardpeet]

LGTM :)