Changes in version 0.0.5                        

  - Add gradethis_equal() method for ggplot objects (#37).

                 Changes in version 0.0.4 (2022-04-14)                  

  - Allow uses_mappings() to find mappings that appear in every layer of
    the plot (#35).

                 Changes in version 0.0.3 (2022-02-24)                  

  - Fixed a bug when fail_if_not_ggplot() attempted to access a
    gradethis .result object (#33)

                 Changes in version 0.0.2 (2021-12-22)                  

New Features

  - New functions for checking plot labels (#22)
      - get_labels() lists (a subset of) the labels of a plot
      - uses_labels() checks if labels match their expected values

  - Added fail_if_not_ggplot() for use in grading code to check that the
    submitted result is a ggplot, powered by the lower-level testing
    function is_ggplot() (#29).

Improvements and Updates

  - Improve handling of ... in uses_labels() (#26)
  - Unnamed arguments to uses_labels() check if label is set (#27)
  - Check for aes params in uses_geom_param() (#28)

                 Changes in version 0.0.1 (2021-10-22)                  

  - Initial release of ggcheck