Upgrade offline-github-changelog to version 2.4.0

[depfu]

👉 This PR is queued up to get rebased by Depfu

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ offline-github-changelog (^1.7.0 → ^2.4.0)

Sorry, we couldn't find anything useful about this release.

---

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[coveralls]

Coverage remained the same at 86.316% when pulling c6890be on depfu/update/npm/offline-github-changelog-2.4.0 into 437bd70 on master.