Update README.md (#4)

remove "->" arrow because it unintentionally closes the HTML comment

Author: rmccorm4

README.md

@@ -1,6 +1,6 @@
 # Exercise #7: CLI Task Manager
 
-[![exercise status: released](https://img.shields.io/badge/exercise%20status-released-green.svg?style=for-the-badge)](https://gophercises.com/exercises/task) <!--[![demo: ->](https://img.shields.io/badge/demo-%E2%86%92-yellow.svg?style=for-the-badge)](https://gophercises.com/demos/cyoa/)-->
+[![exercise status: released](https://img.shields.io/badge/exercise%20status-released-green.svg?style=for-the-badge)](https://gophercises.com/exercises/task) <!--[![demo](https://img.shields.io/badge/demo-%E2%86%92-yellow.svg?style=for-the-badge)](https://gophercises.com/demos/cyoa/)-->
 
 ## Exercise details