Update README.md

Author: jellespijker

README.md

@@ -1,7 +1,7 @@
 [![hacs_badge](https://img.shields.io/badge/HACS-Custom-orange.svg?style=for-the-badge)](https://github.com/custom-components/hacs)
 # Home Assistant Ultimaker printers
 
-![sensors](resources/home-assistant-um.png)
+![sensors](https://github.com/jellespijker/home-assistant-ultimaker/raw/main/resources/home-assistant-um.png)
 
 Adds support for the following ultimaker printer sensors: