Update README.md

Author: steccas

README.md

@@ -31,7 +31,7 @@ Most notably, the account login is persistent between app restart, including OS
 
 The client, unlike when using the bridge and so SMTP client, will not work with the mail locally; this means that it is like using Proton Mail from the browser.
 
-![screenshot-win](https://github.com/Steccas/ProtonClient/blob/main/screens/screenshot-win.jpg)
+![screenshot-linux](https://github.com/Steccas/ProtonClient/blob/main/screens/screenshot-linux.jpg)
 
 ## About protonmail
 What is ProtonMail?