Version 0.3.0

• Add resource argument to call_sedt_api() that supports a wider range of resource inputs: URLs (including ArcGIS FeatureLayer and Table URLs), spatial data file paths, sf or sfc object, and data frames with columns matching the supplied resource_lat_column and resource_lon_column values. All input data must use POINT geometry. See arcgislayers::arc_read() for more on working with ArcGIS layer URLs.
• Add default values ("lat" and "lon") for resource_lat_column and resource_lon_column.
• Allow users to set default acs_data_year using the "sedtR.year" option.
• Use .onAttach intead of .onLoad for package start-up messages (consistent with guidance)