Changes in version 0.4.0                        

  - The new n_cpu option in cartogram_cont() and cartogram_ncont()
    enables distortion calculation across multiple CPU cores (thanks to
    e-kotov!)
  - The default threshold value in cartogram_cont() will now
    automatically increase if the weighting variable contains a
    significant number of zeros.
  - Additional tests have been implemented.

                 Changes in version 0.3.0 (2023-05-26)                  

  - Remove sp, rgdal and maptools from examples and suggestions.
  - cartogram_cont() has a new parameter verbose = FALSE to hide print
    of size error on each iteration.

                 Changes in version 0.2.2 (2020-08-26)                  

  - Fix geometry replacement in cartogram_ncont

                 Changes in version 0.2.0 (2019-12-07)                  

  - Migrated all functions to sf, fixed problems with multipolygons.
  - cartogram functions won't accept features with longitude/latitude
    coordinates anymore.

                 Changes in version 0.1.1 (2018-12-01)                  

  - Update sf code. Thanks to @Nowosad for speeding things up!

                 Changes in version 0.1.0 (2018-06-21)                  

  - Non-Overlapping Circles Cartogram (Dorling)

                 Changes in version 0.0.3 (2018-05-22)                  

  - sf support added

                 Changes in version 0.0.2 (2016-09-28)                  

  - Non-contiguous Area Cartogram
  - Prepare data with missing or extreme values before cartogram
    calculation for faster convergence

                 Changes in version 0.0.1 (2016-08-30)                  

  - Initial Release