Update README.md

Author: purejava

README.md

@@ -13,7 +13,7 @@ Plug-in for Cryptomator to store vault passwords in KeePassXC
 For documentation please take a look at the [Wiki](https://github.com/purejava/keepassxc-cryptomator/wiki).
 
 # Donation
-If you like this project, you can give me a cup of coffee :)
+If you like this project, why not buy me a cup of coffee?
 
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