Release v1.2.0 (#596)

* Bump version to 1.2.0

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* Switch from stan-dev r-universe to R-multiverse for cmdstanr

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* Use YAML literal block for extra-repositories in workflows

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Co-authored-by: sbfnk-bot <242615673+sbfnk-bot@users.noreply.github.com>

export function

Increment version number to 1.1.1

Increment version number to 1.1.0

update version requirements

Increment version number to 0.1.0

add wastewater-informed COVID forecasting (#334)