Bump coveralls from 3.0.6 to 3.0.9

[dependabot-preview]

Bumps coveralls from 3.0.6 to 3.0.9.

Release notes

Sourced from coveralls's releases.

Maintenance, dependency refinement

• removed Istanbul, mocha dependencies
• reverted cobertura-parse support (package dependency archived)
• removed snyk (automated security updates from GitHub via Dependabot enabled)
• improved Windows support

Feature / maintenance updates

Added:

• Cobertura support (@ly-cultureiq)

Fixed:

• flag_name handling (@joscha)

Improved

• ES6-ified codebase (@XhmikosR)
• AppVeyor tests (@XhmikosR)
• GitHub Actions (@XhmikosR)

Commits

• See full diff in compare view

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[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.