[@types/node-notifier] Update typings

[lorenzorapetti]

I've updated the typings to reflect the new node-notifier api. This is also needed for jestjs/jest#7994.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).
• Provide a URL to documentation or source code which provides context for the suggested changes: Migrate @jest/reporters to TypeScript jestjs/jest#7994
• Increase the version number in the header if appropriate.
• If you are making substantial changes, consider adding a tslint.json containing { "extends": "dtslint/dt.json" }.

[typescript-bot]

@loryman Thank you for submitting this PR!

🔔 @tkqubo - please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

If no reviewer appears after a week, a DefinitelyTyped maintainer will review the PR instead.

[typescript-bot]

After 5 days, no one has reviewed the PR 😞. A maintainer will be reviewing the PR in the next few days and will either merge it or request revisions. Thank you for your patience!

[SimenB]

@loryman should probably include the changes in jestjs/jest@923a3f7#diff-158238ccba3a9e41ec14ac3bb9833a11

[lorenzorapetti]

@loryman should probably include the changes in facebook/jest@923a3f7#diff-158238ccba3a9e41ec14ac3bb9833a11

Done!