Bump @ember/optional-features from 2.0.0 to 2.1.0 (#896)

Bumps [@ember/optional-features](https://github.com/emberjs/ember-optional-features) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/emberjs/ember-optional-features/releases)
- [Changelog](https://github.com/emberjs/ember-optional-features/blob/master/CHANGELOG.md)
- [Commits](https://github.com/emberjs/ember-optional-features/commits)

---
updated-dependencies:
- dependency-name: "@ember/optional-features"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]