Update mongodb to version 2.2.9 🚀

[greenkeeperio-bot]

Hello lovely humans,

mongodb just published its new version 2.2.9.

State	Update 🚀
Dependency	mongodb
New version	2.2.9
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of mongodb.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

---

The new version differs by 15 commits .

• 295fa39 Updated version to V2.0.9
• 9554f59 minor fix for promoteBuffers
• 796298f test fixes
• f08ad76 Added missing promoteBuffers test
• 7553638 ensure promoteBuffers is propegated in same fashion as promoteValues and promoteLongs
• f846581 Merge branch 'patch-5' of https://github.com/vkarpov15/node-mongodb-native into 2.2
• a1ca631 fix(collection): don't treat ObjectId as object for mapReduce scope
• cd783aa added tags for promoteValues/promoteLong/raw to find/findOne and aggregate
• 82fd87c Merge pull request #1394 from kay-kim/2.2
• 96d6d3a added minor test fixes
• 46e59ac 2.2 docs: fix left hand mongodb.com image and link
• cec4ecc updates for 2.2 version of the manual and reorder tutorials
• 65ccd28 NODE-802 test case showing working domain socket connection using MongoClient
• 8b397f1 NODE-800 Added promoteValues flag (default to true) to allow user to specify they only want wrapped BSON values back instead of promotion to native types.
• f5217bc fixes for passing down of promoteLongs

See the full diff.

---

This pull request was created by greenkeeper.io.

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[codecov-io]

Current coverage is 92.12% (diff: 100%)

Merging #2608 into master will increase coverage by <.01%

@@             master      #2608   diff @@
==========================================
  Files            98         98          
  Lines         11956      11956          
  Methods        1463       1463          
  Messages          0          0          
  Branches       1931       1931          
==========================================
+ Hits          11013      11014     +1   
+ Misses          943        942     -1   
  Partials          0          0          

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