Update mongoose to version 4.2.3 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

mongoose just published its new version 4.2.3, 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 mongoose – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 254 commits .

• 2df330b release 4.2.3
• 7507a35 docs; remove unclear doAsync function in middleware.jade (Fix #3506)
• 209c9a9 Merge pull request #3498 from mleanos/user-pass-options-empty-strings
• 6b6c3f3 optionsProvideAuthenticationData logic refactor
• 6b24976 fix; work around mpromise swallowing exceptions in .then() (Fix #3478)
• 5e78a56 refactor; put save() behind helper function so we can avoid promises internally re: #3478
• 54219a0 docs; clean up addToSet(), etc. links in subdocs.jade (Fix #3477)
• 8db9f3f fix; ability to cast numbers to booleans (Fix #3475)
• d1bee77 fix; properly report CastError for subdoc arrays in findOneAndUpdate (Fix #3468)
• a9f3a6f repro; #3468
• 14b9b45 fix; Model.geoNear returns an ES6 promise (Fix #3458)
• 3866ffd Merge branch 'master' of github.com:Automattic/mongoose
• 985c8cf now working on 4.2.3
• 780fe6b Merge pull request #3491 from ChristianMurphy/eslint-fix
• 31d0458 release 4.2.2

There are 250 commits in total. See the full diff.

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