Manage the life cycle of your exported functions with shared
  conventions, documentation badges, and non-invasive deprecation
  warnings. The 'lifecycle' package defines four development stages
  (experimental, maturing, stable, and questioning) and three deprecation
  stages (soft-deprecated, deprecated, and defunct). It makes it easy
  to insert badges corresponding to these stages in your documentation.
  Usage of deprecated functions are signalled with increasing levels
  of non-invasive verbosity.

  WWW: https://cran.r-project.org/web/packages/lifecycle/