What's Changed
* new example: buoyant-bubble with a Boussinesq system (velocity extrapolation in time + pressure solver) (AGH eng. project by Michał Kowalczyk Caastlefox) by slayoo in https://github.com/open-atmos/PyMPDATA/pull/495
* fixes in docs formatting for the Boussinesq example; docstring re-formatting in many files (due to precommit bump) by slayoo in https://github.com/open-atmos/PyMPDATA/pull/504
**Full Changelog**: https://github.com/open-atmos/PyMPDATA/compare/v1.2.6...v1.3.0
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