fix typo .to_h -> .to_hash
fix typo .to_h -> .to_hash

splashblot/dronedb,splashblot/dronedb,splashblot/dronedb,CartoDB/cartodb,CartoDB/cartodb,CartoDB/cartodb,splashblot/dronedb,splashblot/dronedb,CartoDB/cartodb,CartoDB/cartodb