Update prompt when tests fail

[silverlight513]

Do you want to request a feature or report a bug?
Update?

What is the current behavior?
When snapshots fail jest shows a prompt for a user to update out of date snapshots.

Inspect your code changes or run with `yarn test -- -u` to update them.

Yarn is now on version 1.0 and doesn't require the double dash before sending command line arguments. We should probably update the prompt to remove the double dash. I'd be willing to make a PR but I'm busy over the next few days.

[thymikee]

Closing this in favor of #4440

[github-actions]

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