Typo fix (mbeaudru#112)

pawelsberg · mbeaudru · commit f2da9f2ea800 · 2018-03-11T12:58:04.000+01:00
diff --git a/README.md b/README.md
@@ -1368,7 +1368,7 @@ class Square extends Polygon {
 
 In addition to [Promises](#promises), there is a new syntax you might encounter to handle asynchronous code named *async / await*.
 
-The purpose of async/await functions is to simplify the behavior of using promises synchronously and to perform some behavior on a group of Promises. Just as Promises are similar to structured callbacks, async/await is similar to combining generators and promises. Async functions *always* returns a Promise. ([Ref: MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function))
+The purpose of async/await functions is to simplify the behavior of using promises synchronously and to perform some behavior on a group of Promises. Just as Promises are similar to structured callbacks, async/await is similar to combining generators and promises. Async functions *always* return a Promise. ([Ref: MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function))
 
 > **Note :** You must understand what promises are and how they work before trying to understand async / await since they rely on it.
 
