Fix newline after contributor workshop slide deck

Author: danicat

README.md

@@ -83,5 +83,5 @@ Please submit a PR with your slides in a subdirectory named like this:
 
 ### Extras
 
-[Go Contributors Workshop Slide Deck](https://goo.gl/pjeuFg)
+[Go Contributors Workshop Slide Deck](https://goo.gl/pjeuFg)  
 [Go Tooling Workshop](http://github.com/campoy/go-tooling-workshop) by Francesc Campoy