Bump react-modal from 3.14.4 to 3.15.1 (#518)

Bump react-modal from 3.14.4 to 3.15.1 (#518)

Bumps [react-modal](https://github.com/reactjs/react-modal) from 3.14.4 to 3.15.1.
- [Release notes](https://github.com/reactjs/react-modal/releases)
- [Changelog](https://github.com/reactjs/react-modal/blob/master/CHANGELOG.md)
- [Commits](https://github.com/reactjs/react-modal/compare/v3.14.4...v3.15.1)

---
updated-dependencies:
- dependency-name: react-modal
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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