Update README.md

README.md

@@ -1,7 +1,7 @@
 # Runes Master
 A simple tool for managing runes pages in the famous game of **League of Legends**.
 
-![App Preview](preview.png)
+![App Preview](previews/app.png)
 
 # How does it work?
 
@@ -63,4 +63,4 @@ Runes Master is using **[JQuery](https://jquery.com/)** for the UI and **[League
 - [Community Dragon](http://raw.communitydragon.org/latest/plugins/rcp-be-lol-game-data/global/default/)
 
 # Personal Notes
-**Runes Master** is a project for the subject *Web programming, Design & Usability* of the *Computer Science* course in the *University of Catania*.
+**Runes Master** is a project for the subject *Web programming, Design & Usability* of the *Computer Science* course in the *University of Catania*.