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First release
**Features and Improvements**
- Fixed issue that mongomock not working with mongoengine in insert. Implement the dummy ``WriteConcern`` class, and fix the ``collection.Collection.write_concern`` method.
- Add data persistence function, so you can use mongomock as a fake in-memory mongodb.
**Miscellaneous**
Compatible with:
- pymongo==3.7.1
- mongoengine==0.15.3
- mongomock==3.10.0