++++++++++++++++++++
* | Added functionality for :python:`base_price_imputation` function accepting
| the :python:`to_impute` argument.
* | Aggregation function now works with mean or geometric mean depending
| on :python:`method` argument.
* | The function :python:`calculate_index` introduced offering various
| different index methods.
* | The :python:`index_calculator` pipeline function offers an end-to-end
| pipeline for calculating indices with optional base price imputation.