Add historical services to !setlist using new api filter

[pastorhudson]

Planning Center has added a before and after filter.
planningcenter/developers#486

We should be able to use this to quickly query Service plans.

[pastorhudson]

This is how to get a single date:
https://api.planningcenteronline.com/services/v2/service_types/173868/plans?filter=after,before&sort=sort_date&after=2018-11-10T00:00:00.000Z&before=2018-11-12T03:59:59.999Z

I'm adding this here so I don't forget.