Bump body-parser from 2.2.0 to 2.2.1 in /backend (#11)

Bumps [body-parser](https://github.com/expressjs/body-parser) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/expressjs/body-parser/releases)
- [Changelog](https://github.com/expressjs/body-parser/blob/master/HISTORY.md)
- [Commits](expressjs/body-parser@v2.2.0...v2.2.1)

---
updated-dependencies:
- dependency-name: body-parser
  dependency-version: 2.2.1
  dependency-type: indirect
...

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