Reduced options for Google font weights

[scadergit]

It looks like Google has reduced font weight named instances to 300 to 800. If you choose any font, the most it ever has is the following options. Should I update the library to map weights within this range?

https://github.com/openlayers/mapbox-to-css-font/blob/master/index.js#L1

[scadergit]

Hmm, maybe I spoke too soon, as The common Noto Sans has a broader range.

https://fonts.google.com/noto/specimen/Noto+Sans.

Perhaps the only problem is that Light should be 300, not 200.

https://github.com/openlayers/mapbox-to-css-font/blob/master/index.js#L6

Also looks like Black should be 900.