Changes in version 0.2.2                        

  - Add 121 template: one IV, two parallel mechanisms, one DV.

                 Changes in version 0.2.1 (2026-03-16)                  

  - Prepare for CRAN submission.
  - Add run_app() function to launch an interactive Shiny app for
    building diagrams.
  - Switch to MIT license.
  - Increase maximum allowed lines per box from 3 to 5.
  - Fix R CMD check notes (non-portable filenames, explicit exports).

                        Changes in version 0.2.0                        

  - Add new templates: 211, 221, and 2221 for multi-IV designs.
  - Add typology() function for creating 2x2 typology diagrams.
  - Reduce whitespace around plots with auto-computed axis limits.
  - Add 111_moderator and 111_confounder templates.

                        Changes in version 0.1.0                        

  - Initial release on GitHub.
  - Core causal_plot() function with templates: 111, 1111, 11111, 1121,
    1211, 1221, and bathtub.
  - Customizable labels, colors, fonts, corner radius, and arrow styles.
  - Built on ggplot2, ggforce, and ggtext.