Update dependency coveralls to ^3.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
coveralls	devDependencies	minor	^3.0.14 -> ^3.1.0

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Release Notes

nickmerwin/node-coveralls

v3.1.0

Compare Source

• Handle service_job_number for parallelism in Travis and CircleCI (#​290) 705c3b5
• Update sinon to v7.5.0. (#​288) eb6dc35

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This is a minor release due to the change in behavior for CircleCI, which now uses the Workflow ID to merge parallel coverage jobs:

    options.service_number = process.env.CIRCLE_WORKFLOW_ID;
    options.service_job_number = process.env.CIRCLE_BUILD_NUM;

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