Update README.md

syntax error small fix

Author: carolcarriazo

README.md

@@ -34,6 +34,7 @@ The project uses the following components:
 ## What are we going to build?
 
 ![The UI of the chat app we'll build. It is a window with speech bubbles for text.](https://cdn.glitch.com/0cb30add-c9ef-4c00-983c-e12deb0d4080%2Fchatapp.png?v=1612279601157)
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 *The UI of the app we'll build with this walkthrough*
 
 We'll build a realtime chat app that runs in the browser. It will be built upon the Next.js [create-next-app](https://nextjs.org/docs/api-reference/create-next-app) template, it will contain a React component which will use Ably to send and receive messages. We'll also write a serverless function which will be used to authenticate the client with Ably.