Update README.md

Author: alexgurr

README.md

@@ -11,7 +11,7 @@ A series of **ReactJS coding challenges** with a variety of difficulties. Deep d
 
 <img src="https://www.timetoestimate.com/favicon.png" width=50 /> [Time To Estimate](https://www.timetoestimate.com). A fun, simple way for agile teams to remotely estimate tasks together. Free, with no sign-up required.
 
-<img src="https://www.mixmello.com/logo512-light.png" width=50 /> [mixmello](https://www.mixmello.com). Create remixed versions of your favourite Spotify playlists.
+<img src="https://www.mixmello.com/favicon.png" width=50 /> [mixmello](https://www.mixmello.com). Create remixed versions of your favourite Spotify playlists.
 
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 ## The Challenges