Update README.md

Changed the cover photo of the demo

Author: chengtie

README.md

@@ -25,7 +25,7 @@ As manual operations in Excel exist everywhere, AutoXL is **cross-sectors**. It
 
 ## Demo
 
-[![Demo Video](https://i.imgur.com/6YJRmvv.png)](https://www.youtube.com/watch?v=WtBtnwtyBM4)
+[![Demo Video](https://i.imgur.com/dJFYTs8.png)](https://www.youtube.com/watch?v=WtBtnwtyBM4)
 
 ## Installation
 
@@ -105,4 +105,4 @@ You could [open an issue](https://github.com/MatrixFun/AutoXL/issues) or write t
 
 - Video courses: [Spreadsheet Language and Programming](https://chengtie.thinkific.com/courses/excel-programming-en) and [表格语言与编程](https://study.163.com/course/courseMain.htm?courseId=1211128814&share=2&shareId=480000002246464)
 - Software for spreadsheets: [www.10studio.tech](https://www.10studio.tech)
-- Social media: [YouTube](https://www.youtube.com/watch?v=Jr1x1EnP1qA&list=PLOeixAylgNENCnQr9pUWjyAVFzJGbiOSX), [LinkedIn](https://www.linkedin.com/in/chengtie/)
+- Social media: [YouTube](https://www.youtube.com/watch?v=Jr1x1EnP1qA&list=PLOeixAylgNENCnQr9pUWjyAVFzJGbiOSX), [LinkedIn](https://www.linkedin.com/in/chengtie/)