chore(deps): bump bson from 1.1.3 to 1.1.6

Bumps [bson](https://github.com/mongodb/js-bson) from 1.1.3 to 1.1.6.
- [Release notes](https://github.com/mongodb/js-bson/releases)
- [Changelog](https://github.com/mongodb/js-bson/blob/v1.1.6/HISTORY.md)
- [Commits](mongodb/js-bson@v1.1.3...v1.1.6)

---
updated-dependencies:
- dependency-name: bson
  dependency-type: indirect
...

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Author: dependabot[bot]