Update Readme

README.md

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 **Academic** is a framework to help you create a beautiful website quickly. Perfect for personal, student, or academic websites. [Check out the latest demo](http://gcushen.github.io/hugo-academic-demo/) of what you'll get in less than 10 minutes.
 
-[![Screenshot](https://raw.githubusercontent.com/gcushen/hugo-academic/master/images/screenshot.png)](https://github.com/gcushen/hugo-academic/)
+[![Screenshot](https://raw.githubusercontent.com/gcushen/hugo-academic/master/academic.png)](https://github.com/gcushen/hugo-academic/)
 
 Key features: