message: fix(configs): allow React 17 in peer dependencies
  [React 17](https://reactjs.org/blog/2020/08/10/react-v17-rc.html) is currently in the RC phase. It
  contains only minor breaking changes, which means Circuit UI is compatible with it.
diff: "@sumup/icons": "1.x",
  "@sumup/intl": "1.x",
  "emotion-theming": "10.x",
  - "react": ">=16.8.0 < 17",
  - "react-dom": ">=16.8.0 < 17"
  + "react": ">=16.8.0 < 18",
  + "react-dom": ">=16.8.0 < 18"
  }
  }
  