Update mongoose to the latest version 🚀

[greenkeeper]

The dependency mongoose was updated from 5.4.16 to 5.4.17.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[greenkeeper]

• The dependency mongoose was updated from 5.4.16 to 5.4.18.

Update to this version instead 🚀

Commits

The new version differs by 11 commits.

• 52046e1 chore: release 5.4.18
• 2d34bfb test(discriminator): fix tests on older node versions
• ae82062 fix(model): remove $versionError from save options for better debug output
• a465059 fix(model): make subclassed models handle discriminators correctly
• fa662ee test(model): repro #7547
• 39eec7c fix(document): handle nested virtuals in populated docs when parent path is projected out
• c7db725 test(document): repro #7491
• 3fa119e Merge branch 'master' of github.com:Automattic/mongoose
• a72cd6d docs: remove datantify as a sponsor
• e699426 docs: add note about typescript to contributing.md
• 07f31f1 chore: now working on 5.4.18

See the full diff