Update README.md

Author: atalantus

README.md

@@ -1,7 +1,7 @@
 # Wave-function-collapse algorithm with Unity
 This Unity example project utilizes the wave-function-collapse algorithm to procedurally generate levels.
 
-![Demo image](./images/Demo.png)
+![Demo image](./images/Demo0.png)
 
 ## About this project
 Using Unity version `2019.1.14f1`.