example styles: major city names not visible

[2mol]

Hi! First of all, thanks for your amazing work, setting up the library was pretty nice, and it's so much fun to be able to play with maps in elm!

I noticed a problem with all of the example styles, as well as custom generated ones: major cities fail to show up. I've attached a screenshot of an example. There is a hole where you'd expect a label for "Sydney" This happens to be the Outdoor style, but it's a problem with every single one I tried. I'm more than happy to dig down a bit more, let me know how I can help. I'm just now learning both Mapbox and your library.

Note that when I convert the Mapbox basic template, the same problem shows up. In mapbox studio itself, the map seems fine, cf second screenshot.