feat: support mongodb array update operator $[] #442
      
        
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fixes #378
This pr adds support for the mongodb array update operator $[] by updating mongo-object to the newest version. mongo-object received an update lately specifically to support this feature in the way described in #378 (comment).
This pr only adds tests to show that the update operator works with this version of mongo-object.
Please feel free to move, change and extend the tests and edit the commit message.