Regcensus

* Refactors verbose argument in get* and list* functions
* Refactors agency calls to account for new agencies (as of State RegData 5.0)
* Updates tests for new data
* Adds warning about compatibility for older data

Hotfix to block users from passing more than one year for document-level queries.

Updates library to account for brand new RegCensus API.

Uses the serierperiods endpoint to get list of series for a particular jurisdiction rather than getting all available series.

Add clusters to `get_values()` and `list_clusters()`.

Allows doctype to be passed to `list_dates()`.