fix typo in usage
fix typo in usage

gmcvicker/WASP,smozaffari/WASP,bmvdgeijn/WASP,smozaffari/WASP,gmcvicker/WASP,smozaffari/WASP,smozaffari/WASP,gmcvicker/WASP,bmvdgeijn/WASP,bmvdgeijn/WASP,smozaffari/WASP,gmcvicker/WASP,bmvdgeijn/WASP