Update all npm dependencies (2020-10-23)

[depfu]

This is your monthly update of all npm dependencies. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ mocha (8.1.3 → 8.2.0, minor) · Repo · Changelog · Release · Diff

✳️ npm-check-updates (9.0.2 → 9.1.2, minor) · Repo · Diff

✳️ @types/underscore (1.10.23 → 1.10.24, patch) · Repo

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[depfu]

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