Upgrade eslint-plugin-promise to version 5.1.1

[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?

✳️ eslint-plugin-promise (^4.2.1 → ^5.1.1) · Repo · Changelog

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[coveralls]

Coverage remained the same at 95.313% when pulling 08e2da1 on depfu/update/npm/eslint-plugin-promise-5.1.1 into 309f5ed on master.