Water level predictions throws error if no interval is specified

[GClunies]

According to NOAA API, default time interval for predicted water levels is 6 minutes. This does not require interval to be specified in a call to the API.

Currently coops.get_data() requires that an interval is supplied to the function, if no interval is supplied (see options here) it throws an error.

ValueError: No interval specified for water level predictions. See https://tidesandcurrents.noaa.gov/api/#interval for list of available intervals

Code used to generate error:

df_pred = coops.get_data(begin_date="20150101",
                       end_date="20180101",
                       stationid="9447130",
                       product="predictions",
                       datum="MLLW",
                       units="english",
                       time_zone="lst_ldt")