What's Changed
* Shade log4j for databricks fat jar by WeichenXu123 in https://github.com/combust/mleap/pull/812
* ScalaPB & sbt Upgrade by emitc2h in https://github.com/combust/mleap/pull/818
* Upgrade xgboost dependency to be 1.6.1 version by WeichenXu123 in https://github.com/combust/mleap/pull/822
* Additional Math unary operations by shyamsunder00 in https://github.com/combust/mleap/pull/826
* Added backward compatibility fix for XGBoost models by chaitanya-basava in https://github.com/combust/mleap/pull/829
* Address MathBinary issue with zeros defaults by arthurarj in https://github.com/combust/mleap/pull/828
New Contributors
* emitc2h made their first contribution in https://github.com/combust/mleap/pull/818
* shyamsunder00 made their first contribution in https://github.com/combust/mleap/pull/826
* chaitanya-basava made their first contribution in https://github.com/combust/mleap/pull/829
* arthurarj made their first contribution in https://github.com/combust/mleap/pull/828
**Full Changelog**: https://github.com/combust/mleap/compare/v0.20.0...v0.21.0