Add an example using `window.fetch`

[styfle]

The readme says "Universal. Can support any server framework or REST client"

Can restyped utilize window.fetch?

If so, can you add an example to the README?

[rawrmaan]

Well, it can support any server framework or REST client, but someone needs to write the typings. Currently there are only typings written for axios. You can use the definition file in that repo as a starting point for writing a definition for any other client, including window.fetch.