fix xcode 11 beta

code ./node_modules/react-native/React/Base/RCTModuleMethod.mm

Replace

return RCTReadString(input, "__unused") ||

RCTReadString(input, "attribute((unused))");

To

return RCTReadString(input, "attribute((unused))") ||

RCTReadString(input, "attribute((unused))") ||

RCTReadString(input, "__unused");