Update README.md

Author: lukel97

README.md

@@ -5,7 +5,7 @@ A React based web app that books group rooms across Trinity.
 To install the dependencies, run `yarn` or `npm install` from the root directory.
 Then `cd client` and run the same command to install the dependencies for the client.
 
-# Setting up the development server
+## Setting up the development server
 
 `node server/Server.js` to set up the API server
 `cd client && yarn start` to run the React client