Update examples

[ahstro]

The code is updated to Elm 0.19, but the README still uses Json.Decode's (:=), an old version of Http.get, and backtick syntax.

I'm still trying to figure out how to use the library, but when I do, I might create a PR for this, unless someone (hopefully) beats me to it :relaxed:

[nicklayb]

Same here, It's not clear how to use the library in 0.19. I thought of doing the same as you but I still not figured it out, did you?