Bump eslint-plugin-import from 2.20.2 to 2.21.1

Bumps [eslint-plugin-import](https://github.com/benmosher/eslint-plugin-import) from 2.20.2 to 2.21.1.
- [Release notes](https://github.com/benmosher/eslint-plugin-import/releases)
- [Changelog](https://github.com/benmosher/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](import-js/eslint-plugin-import@v2.20.2...v2.21.1)

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