Changes in version 2.1.1 (2023-08-31)                  

  - Fixed conflict between Details section of package man page and
    DESCRIPTION content.

                 Changes in version 2.1.0 (2021-04-09)                  

  - Add a vignette.
  - Fix outputs in the S3 methods summary and print.
  - Add formula to output of print methods.
  - Fix problem for predicting with the argument point of function
    backf.cl.
  - Updated README file with link to JOSS paper.