Changes in version 1.2 (2020-02-29)                   

1.  Create factors with explicitly given levels to be consistent with
    the new default of stringsAsFactors=FALSE in R base.

                  Changes in version 1.0 (2019-06-30)                   

1.  Added isniglmmbin() for ISNI computation in GLMM for
    longitudinal/clustered binary outcomes.
2.  Fixed a bug in isnimgm()

                  Changes in version 0.4 (2019-02-04)                   

1.  Fix a bug that causes 'NA' in ISNI computation when a clsuter has no
    observed outcome values.