Bump coveralls from 3.0.3 to 3.1.1

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.3 to 3.1.1.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](nickmerwin/node-coveralls@3.0.3...3.1.1)

---
updated-dependencies:
- dependency-name: coveralls
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>