MAINT: remove python 3.7, deps still not ready
MAINT: remove python 3.7, deps still not ready

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