Update CONTRIBUTING.md

LewisJohnson · web-flow · commit b2545e921694 · 2017-09-01T20:06:46.000+01:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -61,3 +61,4 @@ unity-ui-examples
 ## Note 
  * Feel free to add to the .gitignore if you're using a diffrent IDE/OS.
  * We only accept C# examples at this time.
+ * There should be no spaces in any directory name.
