Fix typo in README.md file

Fix typo in README.md file

README.md

@@ -91,7 +91,7 @@ import { authMiddleware, metricsMiddleware } from './middleware'
 const beepMiddleware = {
   Query: {
     hello: async (resolve, parent, args, context, info) => {
-      // You can you middleware to override arguments
+      // You can use middleware to override arguments
       const argsWithDefault = { name: 'Bob', ...args }
       const result = await resolve(parent, argsWithDefault, context, info)
       // Or change the returned values of resolvers