undidR 2.0.0

• start_time and end_time columns are now stored as strings in the format specified by date_format column in the empty_diff_df CSV file.
• Fixed as.Date() calls in undid_stage_two(), undid_stage_three(), and plot_parllel_trends() to ensure compatability for R versions 4.0.0 and onwards.

undidR 1.0.2

• Made compatible for R versions 4.0.0 onwards.

undidR 1.0.1

• Fixed the miscalculation of standard weights during stage two under common adoption scenarios.

undidR 1.0.0

• Initial CRAN submission.
• Updated installation instructions.

undidR 0.1.0

• Initial development version (not yet submitted to CRAN).
• Provides a framework for implementing difference-in-differences with unpoolable data.