Changes in version 0.4.4                        

  - Bump roxygen2 to 8.0.0 and add a package level helpfile.

                        Changes in version 0.4.3                        

  - Implement some code optimizations.

                        Changes in version 0.4.2                        

  - RMVMR now requires MVMR version 0.4.3 or later.

                        Changes in version 0.4.1                        

  - Fixed a bug in plot_rmvmr() in the ggplot2::scale_x_continuous()
    calls. RMVMR should now run under version 4 of ggplot2, which is due
    to be released soon.

                         Changes in version 0.4                         

  - RMVMR now required R 4.1.0 or newer. This is because of the
    requirement of a dependency package of ggplot2, the scales package,
    now having this requirement (which is the new tidyverse requirement
    on release of R 4.5.0).