Fixed the preview GIF

Author: mennovogel

README.md

@@ -4,7 +4,7 @@ Imagin is an Android library, written in Kotlin. It attaches to an ImageView and
 
 This library is currently supported on Android 5.1 Lollipop (22) and higher. 
 
-![](https://github.com/nos-digital/imagin/preview.gif)
+![](https://github.com/nos-digital/imagin/raw/master/preview.gif)
 
 ## Usage
 
@@ -44,4 +44,4 @@ Imagin.with(imageWrapper, imageView)
 
 ## Licence
 
-Imagin is available under the MIT license.
+Imagin is available under the MIT license.