Update README Portmaster image cache

solution from: https://stackoverflow.com/questions/26898052/how-to-force-image-cache-update-in-readme-rst-on-github/66030456#66030456
safing · Nov 10, 2021 · 3193cd3 · 3193cd3
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 Portmaster is a free and open-source application that puts you back in charge over all your computer's network connections.
 Developed in the EU 🇪🇺, Austria.
 
-![Portmaster User Interface](https://assets.safing.io/portmaster/full-interface.png)
+![Portmaster User Interface](https://assets.safing.io/portmaster/full-interface.png?)
 
 **⚠️ Disclaimer**