Fix screenshot URL in README for theme showcase

README.md

@@ -3,7 +3,7 @@
 Cactus is a minimalistic theme for bloggers based on the default theme of the same-named [Cactus static site generator](//github.com/koenbok/Cactus) written in Python and [Nick Balestra](//github.com/nickbalestra/kactus)'s Jekyll port. Noteworthy features of this Hugo theme are the integration of a comment-system powered by Disqus, a customizable about page, support for RSS feeds, syntax highlighting for source code and sharing options for blog posts.
 
 
-![Screenshot](https://github.com/digitalcraftsman/hugo-cactus-theme/blob/dev/images/screenshot.png)
+![Screenshot](https://raw.githubusercontent.com/digitalcraftsman/hugo-cactus-theme/dev/images/screenshot.png)
 
 
 ## Installation