Update mongoose to version 4.4.10 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

mongoose just published its new version 4.4.10, 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 14 commits .

• 857af49 chore: release 4.4.10
• 0c8b6e5 fix(document): copy isNew when copying a document
• 4d9e64d test(document): repro #3982
• de72d9b fix(document): don't overwrite defaults with undefined keys
• 24bca87 test(document): repro #3981
• fee9920 fix(populate): merge multiple deep populate opts for the same path
• 4e837d0 test(populate): repro #3974
• 2d87f25 chore: now working on 4.4.10
• 4576995 chore: release 4.4.9
• 230bdb0 fix: upgrade mongodb -> 2.1.10 re https://jira.mongodb.org/browse/NODE-679
• 027d8aa docs: remove conflicting validation.jade
• 77f4458 docs: proper syntax highlighting for acquit examples
• 9723807 chore: now working on 4.4.9
• a36c358 docs(discriminators): correct default discriminator key

See the full diff.

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