README: fix typo
README: fix typo

osrg/earthquake,osrg/earthquake,osrg/namazu,osrg/earthquake,osrg/namazu,osrg/namazu,osrg/earthquake,osrg/earthquake,osrg/namazu,osrg/namazu,osrg/earthquake,osrg/namazu,osrg/earthquake,osrg/namazu