Bump nodemon from 2.0.15 to 2.0.20 (#181)

Bumps [nodemon](https://github.com/remy/nodemon) from 2.0.15 to 2.0.20.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](remy/nodemon@v2.0.15...v2.0.20)

---
updated-dependencies:
- dependency-name: nodemon
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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