Upgrade offline-github-changelog to version 2.3.0

[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 → ^2.3.0)

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

---

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[coveralls]

Coverage remained the same at 97.436% when pulling 5b0c853 on depfu/update/npm/offline-github-changelog-2.3.0 into 354310e on master.

[depfu]

Closed in favor of #151.