Changed suggested OpSim
Changed suggested OpSim

I am not sure that the previously suggested OpSim has observations at the suggested location.  As shown in #49, enigma_1189 does have observations at the chosen location.
rbiswas4/Twinkles,DarkEnergyScienceCollaboration/Twinkles,rbiswas4/Twinkles,DarkEnergyScienceCollaboration/Twinkles,LSSTDESC/Twinkles,LSSTDESC/Twinkles