MAINT: add docs req
MAINT: add docs req

guillochon/MOSFiT,bmockler/MOSFiT,bmockler/MOSFiT,guillochon/MOSFiT,villrv/MOSFiT,mnicholl/MOSFiT,mnicholl/MOSFiT,villrv/MOSFiT,mnicholl/MOSFiT,guillochon/MOSFiT,guillochon/FriendlyFit