graphqlUploadExpress missing createReadStream
I have a server setup as below.   I've added the graphqlUploadExpress - I'm seeing the file come through, however it's missing createReadStream ? 

```
     async function main() {
    // Bootstrap Apollo Server
    // Use Apollo server as express middleware through 'applyMiddleware'
    const { schema } = await getBuiltMesh();
    const server = new ApolloServer({
        schema,
    });
    await server.start();

    // Bootstrap Client App
    // Next.js creates a handler that can be used as express middleware
    await nextApp.prepare();
    const app = express();
    app.get('*', nextApp.getRequestHandler());
    app.use(graphqlUploadExpress({ maxFileSize: 10000000, maxFiles: 10 }));
    server.applyMiddleware({
        app: app
    });
    await new Promise((r) => app.listen({ port: 4000 }, r));
    console.log(`🚀 Server ready at     http://localhost:4000${server.graphqlPath}`);
}
```
 schema
```
scalar Upload

type File {
    filename: String!
    mimetype: String!
    encoding: String!
}

type Mutation {
    createBucket: Boolean
    uploadFile(file: Upload!): Boolean
    uploadFiles(files: [Upload]): Boolean
}

type Query {
    getFiles: Boolean
}
```