Bump coveralls from 3.0.3 to 3.0.6

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.3 to 3.0.6.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](https://github.com/nickmerwin/node-coveralls/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

dependabot-preview[bot] authored GitHub committed

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