Changes in version 1.1.1 (2023-09-19)                  

  - Fixes error when running testthat tests on some platforms, due to an
    incorrect version argument type
  - Internally converts integer matrices to doubles to avoid potential
    overflow

                         Changes in version 1.1                         

  - The core clustering code has been completely re-written and is now
    far more efficient.
    
      - Clustering is typically about ten times faster now.
      - Due to changes in how chi-squared calculations are now made and
        combined clusters are tracked along the way, potential row
        combinations that are "tied" (or have chi-squared reductions
        that are so extremely close as to be essentially tied) may be
        clustered in a different order compared to the version 1.0
        function.
          - This generally only affects earlier clustering steps, well
            above where most cut points will be in practice.
          - If results from a previous version 1.0 clustering need to be
            reproduced exactly for every step, you can force the use of
            the old function by calling greenclust:::.greenclust.v1().
            This feature is not guaranteed to remain in future versions.

  - Verbose output now includes the names of the two rows that were
    combined at each step.

  - Fix for passing data frames to greenclust() (#8)