Update README.md

Link to REPL.it
kylegalbraith · Sep 25, 2017 · 84b1ec5 · 84b1ec5
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 If there are other Guide resources you think campers would benefit from, add them at the bottom in an "Other Resources" section.
 
-You can add diagrams, graphics, or visualizations as necessary. You can also embed relevant YouTube videos and interactive REPL.it code editors.
+You can add diagrams, graphics, or visualizations as necessary. You can also embed relevant YouTube videos and interactive [REPL.it](https://repl.it/) code editors.
 
 Don't use emojis or emoticons in the Guide. freeCodeCamp has a global community, and the cultural meaning of an emoji or emoticon may be different around the world. Also, emojis can render differently on different systems.