Update README.md

Author: flusterIO

README.md

@@ -8,7 +8,7 @@ Checkout our website [here](https://flusterapp.com).
 
 Or check out the current feature list [here](https://github.com/flusterIO)
 
-![Fluster screenshots](screenshot_collage.png)
+![Fluster screenshots](screenshots_collage.png)
 
 ## For Linux Users