Auto enabling in jest config

[JPeer264]

It would be nice to have an autoimport in the jest config file like jest-localstorage-mock got it here.

Current config:

{
  setupFiles: ['./anySetup.js']
}

Expected config:

{
  setupFiles: ['jest-fetch-mock']
}

I didn't look into that any closer how to implement (maybe just a default export of a function), but I could go for a PR if that is a valid improvement.

[JPeer264]

Seems like this already works.