version 1.4.0:
- The {rgl} package dependency has been dropped due to complications generated by it on various operating system. The package functionalities were used in the generic plcm2D plots. Now the plots are done in base R.

version 1.1.5:
- Adapt the code to the change in R 4.0.0 where matrix objects now also inherit from class "array". 

version 1.1.4:
- New LICENCE;
- Add more validation filters in order to avoid errors generated by 
inappropriate input.


version 1.1.0:
- Update following the JOSS reviewing process here
<https://github.com/openjournals/joss-reviews/issues/936>
and here <https://github.com/openjournals/joss-reviews/issues/937>;
- Fix the 3D plot for "ungrouped" mortality surface;
- Add the CITATION file.

version 1.0.0:
- First stable version on CRAN