(includes new reference model 2.1, and copy methods)
* 0.2.2 (2020-06-16)
* fix issue with in_icu for reference model 1
* allow no reports on some days of week (eg. BC: Sundays)
* add fit statistics to help tune reporting noise
* fix bugs in Ensemble
* 0.2.3 (2020-07-30)
* allow cumulative to start from 0 at first point in fit
* allow modifier to change parameter linearly with time
* add code for submitting .csv file for US Forecast Hub
* do interpolation with log(alpha)
* fix bugs
* 0.2.4 (2020-07-31)
* minor bug fix
* 0.2.5 (2020-09-11)
* bug fixes for ensemble
* updates for forecast hub
* 0.2.6 (2020-10-04)
* addition functionality to model vaccination
* 0.2.7 (2020-11-21)
* condition simulation ensembles
* 0.2.8 (2020-11-28)
* add tool to make intervals
* 0.2.9 (2020-11-29)
* minor corrections and improvements
* 0.2.10 (2020-12-04)
* allow gamma delay distributions
* new reference model
* smearing parameters for intervals
* weekly noise reporting
* 0.2.11 (2020-12-12)
* produce intervals for multiple categories at once
* 0.2.12 (2020-12-27)
* add AgeModeller tool to automatically fit age groups
* improve functionality of IntervalMaker
* fix chi^2 for cumul_reset = True
* 0.2.13 (2020-12-29)
* modify linear modifier
* fix chi^2 for daily data
* new reference model
* 0.2.15 (2020-12-30)
* minor corrections and additions
* 0.2.16 (2021-01-02)
* fix for interval maker for scenarios with future transitions
* modified file format for scenario hub
* 0.2.17 (2021-01-27)
* fixes for backup parameter for interval maker
* set protocol level for pickling models
* add new model (2_8) with second variant infection cycle
* 0.2.18 (2021-01-31)
* let fit skip specified dates (xmas period for example)
* 0.2.19 (2021-02-14)
* add option to produce simulated weekly data
* minor fix for copy
* 0.2.20 (2021-03-10)
* fix issues with Ensemble
* 0.2.21 (2021-03-28)
* fix mistake in Ensemble transitions
* 0.2.22 (2021-08-22)
* add feature to combine evolve_expectations and generate_data
* improve optimization for local fits (cumul_reset)
* 0.2.23 (2021-09-05)
* add method to convert population future expectations to Poisson variates
* add option for optimizer to skip zeros (no report days) for fit to cumulative
* 0.3.0 (2021-12-09)
* add new connector: Collector
* add new class: Operator
* produce model 3.1 (4.1) for omicron with escape
* 0.3.1 (2022-01-14)
* fix issue with Collector
* updates to reference models
* add option to optimizer to specify start day for iterations
* 0.3.2 (2022-01-22)
* fix issue with Adder and Subtractor: prevent pop ratios from exceeding 1.
* 0.3.3 (2022-08-30)
* fix issue with Population and Propagator: add checks against negative expectation or probability