docs: update readme

Author: mingrammer

README.md

@@ -6,7 +6,7 @@
 
 A comprehensive collection of free online tools designed to make developers' lives easier. All tools work entirely in your browser without requiring any downloads or installations.
 
-<a href="https://www.buymeacoffee.com/mingrammer"><img src="https://img.buymeacoffee.com/button-api/?text=Buy me a coffee&emoji=&slug=mingrammer&button_colour=FFDD00&font_colour=000000&font_family=Cookie&outline_colour=000000&coffee_colour=ffffff" /></a>
+[![Buy me a coffee](https://img.buymeacoffee.com/button-api/?text=Buy%20me%20a%20coffee&emoji=&slug=mingrammer&button_colour=FFDD00&font_colour=000000&font_family=Cookie&outline_colour=000000&coffee_colour=ffffff)](https://www.buymeacoffee.com/mingrammer)
 
 ## Available Tools