Update engines according to the documentation

[ek-tereshko]

To make version in README.md and in package.json same

• [x] Does all of your new or changed code have unit tests?
• [x] Is overall unit test statement coverage still above 85%?
• [x] Is code style linting passing with npm run lint?
• [ ] Is the related GitHub issue number included in your branch name? ex branch name: fix/12-some-bug
• [ ] Is the related GitHub issue number included in your pull request title? example PR title: "12 - Fixes some bug"
• [x] Is documentation still up to date after your change?

[ejfrancis]

Good catch! Thanks for the PR