Fix link

lessons/01-setting-up/README.md

@@ -16,7 +16,7 @@ npm install
 npm start
 ```
 
-Now open up http://localhost:8080
+Now open up [http://localhost:8080](http://localhost:8080)
 
 Feel free to poke around the code to see how we're using webpack and npm
 scripts to run the app.