Update dependency coveralls to v3.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coveralls	3.0.14 -> 3.1.1

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Release Notes

nickmerwin/node-coveralls (coveralls)

### [`v3.1.1`](https://redirect.github.com/nickmerwin/node-coveralls/releases/tag/3.1.1): Maintenance / Security updates [Compare Source](https://redirect.github.com/nickmerwin/node-coveralls/compare/v3.1.0...3.1.1) - swapped `exec` for `execFile`. Credit: Adar Zandberg from the CxSCA AppSec team at Checkmarx. - updated `devDependencies` - merged Dependabot PRs ### [`v3.1.0`](https://redirect.github.com/nickmerwin/node-coveralls/releases/tag/v3.1.0): Improved CircleCI / Travis parallelism support [Compare Source](https://redirect.github.com/nickmerwin/node-coveralls/compare/v3.0.14...v3.1.0) - Handle `service_job_number` for parallelism in Travis and CircleCI ([#​290](https://redirect.github.com/nickmerwin/node-coveralls/issues/290)) [`705c3b5`](https://redirect.github.com/nickmerwin/node-coveralls/commit/705c3b5) - Update sinon to v7.5.0. ([#​288](https://redirect.github.com/nickmerwin/node-coveralls/issues/288)) [`eb6dc35`](https://redirect.github.com/nickmerwin/node-coveralls/commit/eb6dc35) *** This is a `minor` release due to the change in behavior for CircleCI, which now uses the Workflow ID to merge parallel coverage jobs: ```javascript options.service_number = process.env.CIRCLE_WORKFLOW_ID; options.service_job_number = process.env.CIRCLE_BUILD_NUM; ```

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