Update README.md

Author: user0706

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img height="100" src="https://github.com/user0706/PyRex/blob/master/icons/windowIcon.png?raw=true">
+  <img height="100" src="https://github.com/user0706/PyRex/blob/master/Qt_ui/icons/windowIcon.png?raw=true">
 </p>
 
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