Update README.md

Author: Awilum

README.md

@@ -1,6 +1,6 @@
 <h1 align="center">Admin Plugin for <a href="https://flextype.org/">Flextype</a></h1>
 
-![preview](preview.png)
+![preview](https://github.com/flextype-plugins/admin/raw/dev/preview.png)
 
 <p align="center">
 <a href="https://github.com/flextype-plugins/admin/releases"><img alt="Version" src="https://img.shields.io/github/release/flextype-plugins/admin.svg?label=version&color=black"></a> <a href="https://github.com/flextype-plugins/admin"><img src="https://img.shields.io/badge/license-MIT-blue.svg?color=black" alt="License"></a> <a href="https://github.com/flextype-plugins/admin"><img src="https://img.shields.io/github/downloads/flextype-plugins/admin/total.svg?color=black" alt="Total downloads"></a> <a href="https://github.com/flextype/flextype"><img src="https://img.shields.io/badge/Flextype-0.9.8-green.svg?color=black" alt="Flextype"></a> <a href="https://crowdin.com/project/flextype-plugin-admin"><img src="https://d322cqt584bo4o.cloudfront.net/flextype-plugin-admin/localized.svg?color=black" alt="Crowdin"></a> <a href="https://scrutinizer-ci.com/g/flextype-plugins/admin?branch=dev&color=black"><img src="https://img.shields.io/scrutinizer/g/flextype-plugins/admin.svg?branch=dev&color=black" alt="Quality Score"></a> <a href=""><img src="https://img.shields.io/discord/423097982498635778.svg?logo=discord&colorB=728ADA&label=Discord%20Chat" alt="Discord"></a>