prefio 0.2.0

• 🎉🥳 Made prefio tidy! 🎊🎆
• Added a cool new hex sticker!
• Reimplemented preferences using vctrs.
• Implemented methods required for dplyr operations.
• Added a suite of tools for operating on preferences.
• Added two summary functions for preferences:
  1. instant-runoff voting algorithm
  2. covariance matrix based on rankings matrix representation
• Improved preflib interface to fail gracefully, which is why prefio 0.1.1 was taken down from CRAN.

prefio 0.1.1

• Changed string formatting for preferences (now displays as [A > B > C] rather than "A > B > C").
• Fixed a bug when loading preferences from orderings format.
• Allows an empty preferences object (displays preferences(0)).
• Allow blank preferences (displays [blank]).

prefio 0.1.0

• This is the initial release of prefio.