• Bump version to 3.9.0
• Avoid useless data copy in collection when only looking for document count
• Fixes #364. Support no-argument get_database() semantics
• Depend on pymongo<3.6 to fix Travis tests
• Add test for aggregate $size and $ifNull
• Fix creating unwanted field in document when doing a $aggregate on a non-existing nested field
• Add $size and $ifNull operator in aggregate pipeline
• Remove whitespaces in black line
• Fix bug when modifying fields part of the filter in iteration
• Add 'With ... as' statement support
• #356 Fail when projection kwarg used in find_and_modify
• #356 Fix fields kwarg in find_and_modify
• Add a missing comma
• implement support for the $rename operator
• add pep8 back
• fix comments
• Fix travis tests due to broken 3.5 and pypy and use mongo service due to dist:trusty being default
• Fix bug with sort when copying cursor
• #341 Fix querying empty sub-documents returning everything
• Add Collection.drop_indexes and fix not destroyed index on collection drop
• Update README.rst
• Update README install/test instructions
• Add error code to message for DuplicateKeyError
• fixed bug with removing elements from list while iterating on it
• Add dummy missing Collection.reindex/list_indexes
• Fix cursor outdating error when database is updated
• Fix crash when mixing naive and aware datetime
• Fix upsert operation when document has `0` as _id
• Fix cursor limit&skip when passed as slice
• Fix unique_index checking with upsert insertion
• Improve test_sparse_unique_index to test case field set to None
• Making reference to a collection in a driver doesn't create it in Mongo
• MongoClient accept list of URIs as host param
• system.indexes is no longer defined by default (deprecated since MongoDB 3.0)
• Add MongoClient.is_mongos and MongoClient.is_primary
• adding support for the $in operator on a list contains regex objects
• Add 'looking for maintainers' note
• remove me
• add check for empty collection name, incl dotted form
• Update Missing_Features.rst
• Remove unused import
• Fix issue with skipping twice in find (#321)
• #217 find project fields in array (inlucde)
• ignore tmp folders .cache & .eggs
• #273 omit $comment when filtering
• #275 create_index support sparse kwargs
• #313 insert check bson validation
• #312 insert_many raises BulkWriteError on duplicate key
• fix broken build badge
• {$eq: None} match non-exists field
• Remove broken image link from README