Changes in version 0.1.0                        

  - initial release
  - offers one layout -- gg_facet_wrap_months()

                     Changes in version 0.0.0.9003                      

  - replace demo_events() helper with data objects:
      - demo_events_gpt
      - demo_events_overlap

                     Changes in version 0.0.0.9002                      

  - improves reframe_events() helper:
      - adds id_cols arg to make internal grouping operation explicit
      - add informative error messages for when id_cols don't unique
        identify event rows (#3)