Update all development npm dependencies (2021-05-02)

[depfu]

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

What changed?

✳️ @types/node (14.14.41 → 15.0.1, major) · Repo

✳️ @babel/core (7.13.16 → 7.14.0, minor) · Repo · Changelog · Release · Diff

✳️ @babel/preset-env (7.13.15 → 7.14.0, minor) · Repo · Changelog · Release · Diff

✳️ eslint-config-prettier (8.2.0 → 8.3.0, minor) · Repo · Changelog · Diff

✳️ @types/chai (4.2.16 → 4.2.17, patch) · Repo

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