Fix screenshot URL which was seriously mangled

no idea what it was supposed to be pointing to, but the screenshot url was a mess of gobbledegook

README.md

@@ -14,7 +14,7 @@ distributions.</p>
 -->
 
 <!-- Uncomment and modify this when you have a screenshot
-![my-snap-name](/home/%E6%9E%97%E5%8D%9A%E4%BB%81/%E5%B7%A5%E4%BD%9C%E7%A9%BA%E9%96%93/%E7%AC%AC%E4%B8%89%E6%96%B9%E5%B0%88%E6%A1%88/Snapcrafters%20template.%20Fork%20to%20your%20GitHub%20account%20and%20rename%20it%20for%20the%20snap%20you%27re%20creating/screenshot.png "my-snap-name")
+![my-snap-name](screenshot.png?raw=true "my-snap-name")
 -->
 
 <p align="center">Published for <img src="https://raw.githubusercontent.com/anythingcodes/slack-emoji-for-techies/gh-pages/emoji/tux.png" align="top" width="24" /> with 💝 by Snapcrafters</p>