Update README.md

Update the screenshot width

Author: dreampiggy

README.md

@@ -134,7 +134,7 @@ Tips:
 
 + iOS Demo
 
-<img src='https://raw.githubusercontent.com/SDWebImage/SDWebImageSwiftUI/master/Example/Screenshot/Demo-iOS.jpg' width=960 />
+<img src='https://raw.githubusercontent.com/SDWebImage/SDWebImageSwiftUI/master/Example/Screenshot/Demo-iOS.jpg' height=960 />
 
 + macOS Demo
 
@@ -146,7 +146,7 @@ Tips:
 
 + watchOS Demo
 
-<img src='https://raw.githubusercontent.com/SDWebImage/SDWebImageSwiftUI/master/Example/Screenshot/Demo-watchOS.jpg' width=960 />
+<img src='https://raw.githubusercontent.com/SDWebImage/SDWebImageSwiftUI/master/Example/Screenshot/Demo-watchOS.jpg' width=480 />
 
 ## Author