⬆️ Bump coveralls from 3.0.9 to 3.1.0 (#17)

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.9 to 3.1.0.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](nickmerwin/node-coveralls@3.0.9...v3.1.0)

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