* 0.0.10
  - Deprecated `di_ppg_iterate` for `di_iterate`.
  - Updated `di_prop_index` to use a cutoff for determining DI (returning `di_indicator`).
  - Updated `di_ppg`, `di_prop_index`, and `di_80_index` with additional arguments
  - Added a new vignette to describe how to scale DI calculations using `di_iterate`.
  - Fixed `di_ppg_iterate`: since it now uses weight, the calculated references were wrong when a manual reference group was specified.
* 0.0.9
  - Updated `di_ppg_iterate`: remove rows with missing value for success_var, implemented inside `iterate` function within `di_ppg_iterate`.
  - Updated `di_ppg_iterate`: addition of the `weight_var` parameter; if this isn't specified (data set at the individual level), then summarize the input data set to use weights in order to more efficiently calculate DI in multiple iterations.
  - Updated `di_ppg_iterate`: specify columns when using `unnest`.
* 0.0.8
  - Updated `di_ppg_iterate` to filter out scenarios when there are no matched rows when `repeat_by_vars` is used.

* 0.0.7
  - Updated `di_ppg_iterate` to use `slice(i)` instead of manually subsetting rows in order to preserve data frame when `repeat_by_vars` has a single variable
  - Use `tibble` instead of `data_frame` since the latter is deprecated

* 0.0.6
  - Updated `di_ppg_iterate` helper function to include the parameter `repeat_by_vars`.  This allows for repeating DI calculations for every combination of variables specified in `repeat_by_vars`.

* 0.0.5
  - Added `di_ppg_iterate` helper function to iteratively calculate DI across many variables.

* 0.0.4
  - For functions related to the percentage point gap method, add `prop_sub_0` and `prop_sub_1` parameters to account for scenarios where the `proportion` contains 0 or 1 to not lead to a zero MOE when `use_prop_in_moe=TRUE`.  Also, add warning messages when this happens.

* 0.0.3
 - Document definition of `di_indicator` in `di_ppg`
 - Change `pct_hi < reference` to `pct_hi <= reference` in determining DI to be consistent with the methods document from the Chancellor's office
