This release contains the following features and bugfixes:
- Basic support for
$project
and addition of many arithmetic operators #260 [@drorasaf] - Fix aggregation tests for Python3 #267 [@JulieRossi]
- Adapt function parameter names according to pymongo3 #271 [@jordan-heemskerk]
- Empty field values behave like null #270 [@KrissMcMacer]
- Add suport for $size operator #266 [@dgarana]