What's Changed
* Update tutorials by HDembinski in https://github.com/scikit-hep/iminuit/pull/760
* close mncontour for convenience by HDembinski in https://github.com/scikit-hep/iminuit/pull/761
* Added mnmatrix plot by HDembinski in https://github.com/scikit-hep/iminuit/pull/763
* Interpolated mncontour by HDembinski in https://github.com/scikit-hep/iminuit/pull/764
**Full Changelog**: https://github.com/scikit-hep/iminuit/compare/v2.12.2...v2.13.0