chore(deps): update dependency mocha to version 🌟

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
mocha	devDependencies	digest	`` -> a2fc76c	source

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[jennifer-shehane]

Close in favor of #2880 which will upgrade mocha to v5

[renovate]

Renovate Ignore Notification

As this PR has been closed unmerged, Renovate will ignore this upgrade updateType and you will not receive PRs for any future mocha:null digest updates. Digest updates will resume if you update the specified tag at any time.

If this PR was closed by mistake or you changed your mind, you can simply rename this PR and you will soon get a fresh replacement PR opened.