Follow newer version of MATLAB

In MATLAB R2020a, some breaking changes are introduced for MuPAD. For example, MuPAD notebook has been deleted, and some inner functions are renamed and removed. This release contains fixes according to these changes. The least supported MATLAB version is upgraded to R2020b.

v1.1.0

Add mixed-matrix method.

v1.0.1

Fix bug for MuPAD loading on Windows machines.

v1.0.0

First release.