Update README.md

README.md

@@ -4,11 +4,13 @@ This Octoprint plugin adds a preheat button to preheat the nozzle to the printin
 This can be done manually but this plugin makes it more convenient.
 If the target temperature is not zero, the button will instead turn off nozzle heating (cooldown).
 
-![Screenshot](https://i.imgur.com/vGcvSK4.png)
+![Screenshot](https://i.imgur.com/5eTx0pb.png)
 
 ## Setup
 
 Install via the bundled [Plugin Manager](https://github.com/foosel/OctoPrint/wiki/Plugin:-Plugin-Manager)
 or manually using this URL:
 
     https://github.com/marian42/octoprint-preheat/archive/master.zip
+
+If you have trouble updating the plugin, please remove it and reinstall it again.