getMemberships method

Will get a collection of PcoGroupsMembership objects (expecting many) using a path like this: https://api.planningcenteronline.com/groups/v2/groups/1/memberships

Implementation

Future<PcoCollection<PcoGroupsMembership>> getMemberships(
    {PcoGroupsMembershipQuery? query}) async {
  query ??= PcoGroupsMembershipQuery();
  var url = '$apiEndpoint/memberships';
  return PcoCollection.fromApiCall<PcoGroupsMembership>(url,
      query: query, apiVersion: apiVersion);
}