Changes in version 0.4.1.9000                      

  - Sped up PanelMatch and the fect family (IFE / MC) on large panels.
  - Made estimators more robust on large, real-world panels.
  - Added a pkgdown website.
  - Added a cohort-based heatmap function.
  - Added Stata interoperability.
  - Switched the polars dependency to the stable R-multiverse
    repository.