Fix array.includes issue.

Author: agreatfool

src/index.ts

@@ -24,7 +24,7 @@ Utility.withAllStdIn((inputBuff: Buffer) => {
         const exportMap = new ExportMap();
         const fileNameToDescriptor: { [key: string]: FileDescriptorProto } = {};
 
-        const isGrpcJs = ["generate_package_definition", "grpc_js"].includes(codeGenRequest.getParameter());
+        const isGrpcJs = ["generate_package_definition", "grpc_js"].indexOf(codeGenRequest.getParameter()) !== -1;
 
         codeGenRequest.getProtoFileList().forEach((protoFileDescriptor) => {
             fileNameToDescriptor[protoFileDescriptor.getName()] = protoFileDescriptor;