Update tree_traversal.md

Gathros · web-flow · commit 17c996d217d0 · 2017-09-14T21:46:15.000+01:00
diff --git a/chapters/fundamental_algorithms/tree_traversal.md b/chapters/fundamental_algorithms/tree_traversal.md
@@ -598,7 +598,7 @@ namespace Tree_Traversal
 }
 ```
 
-####JavaScript
+#### JavaScript
 
 ```html
 <!DOCTYPE html>
