Fix typo - "that" to "than" (labs42io#23)

Author: mrkiffie

README.md

@@ -2168,7 +2168,7 @@ Promises supports a few helper methods that help make code more conscise:
 
 ### Async/Await are even cleaner than Promises
 
-With `async`/`await` syntax you can write code that is far cleaner and more understandable that chained promises. Within a function prefixed with `async` keyword you have a way to tell the JavaScript runtime to pause the execution of code on the `await` keyword (when used on a promise).
+With `async`/`await` syntax you can write code that is far cleaner and more understandable than chained promises. Within a function prefixed with `async` keyword you have a way to tell the JavaScript runtime to pause the execution of code on the `await` keyword (when used on a promise).
 
 **Bad:**