Update bluebird to version 3.1.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

bluebird just published its new version 3.1.1, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of bluebird – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 16 commits .

• 968426d Release v3.1.1
• d00f4f4 disable wForgottenWarning when all warnings are disabled
• 2b3a7a6 Release v3.1.0
• 8b6834f Allow configuring wForgottenReturn separately
• b83123f Fixes #846
• 68cca19 Fixes #915
• b7a01be Revert "Only warn about immediately forgotten return"
• df5be73 Fixes #870
• 9ee0741 Fixes #841
• e1d119d Only warn about immediately forgotten return
• 60dfc6b Update promise.all.md
• d8e903a Fixes #909
• 2637906 Update anti-patterns.md
• e5b9025 Merge pull request #902 from jasonmerino/patch-1
• 2646090 Change async.series equivalent function from .each to .mapSeries

There are 16 commits in total. See the full diff.

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