0.04  2020-07-27
    - Add user-defined choosers and filters

0.03  2016-09-09
    - remove "from initial collection" debug log

0.02  2016-09-09
    - fix some corner cases in ExcludedDates filter
    - debug logging for filters and choosers
    - testing infrastructure
    - reduce log level for "no automatic assignment config"
    - add an evaluation context for dry_run and filtering/choosing at a time
          other than "now"

0.01  2016-08-19
    - initial release