remove unnecessary gif from package

Author: StackOverflowIsBetterThanAnyAI

README.md

@@ -27,8 +27,6 @@ import { FetchLoading } from 'fetch-loading'
 
 ```
 
-![Preview Default Fetch Loading Animation](https://github.com/StackOverflowIsBetterThanAnyAI/fetch-loading/blob/main/preview.gif)
-
 You can also pass any Hex-value as an argument for the ```theme``` property:
 
 ```