Update README.md

Use stable github URL for git

Author: Agraphie

README.md

@@ -13,7 +13,7 @@ Based on the hash `q.NK3Mt7WrofayazbHj[l.TkCWBWCj[j@f6azIUWXjZWBWCjsoLayM{ofazay
 ##### Example usage
 See the example in [example_main](example/lib/example_extended.dart)
 
-<img src="resources/blur.gif" alt="original" width="255"/>
+<img src="https://raw.githubusercontent.com/agraphie/blurhash/master/resources//blur.gif" alt="original" width="255"/>
 
 ## Getting started
 Include the library in your project. Then call the decoder with a valid Base83 string