Merge pull request #16 from IJMacD/patch-1

Fixed typo

Author: daumann

ES2016.MD

@@ -15,7 +15,7 @@ ES2016 includes the following new features:
 ---
 
 ### `Array.prototype.includes`
-This one is a bit like `indexOf` and very useful to the language by relying on returinng true or false, not `0`. 
+This one is a bit like `indexOf` and very useful to the language by relying on returning true or false, not `0`. 
 
 
 #### Syntax: