docs: fix wrong example for

Author: ahmadalfy

README.md

@@ -59,7 +59,7 @@ Example: `image.jpg => image.webp (instead of image.jpg.webp)`
 Type: `Array<string>`  
 Default: `[]`  
 Description: *list of classes for which the transformation will be ignored*  
-Example: `image.jpg => image.webp (instead of image.jpg.webp)`
+Example: `classIgnore: ['ignore-webp']` will ignore transformation for images with the class `ignore-web` 
 
 #### `extensionIgnore`