Fix grammatical errors

README.md

@@ -95,7 +95,7 @@ It is really a very common situation I can meet in my daily work. Think about ho
 
 ### Learn More
 
-To learn the using of Kingfisher by more examples, take a look at the [Cheat Sheet](https://github.com/onevcat/Kingfisher/wiki/Cheat-Sheet). There we summarized most common tasks in Kingfisher, you can get a better idea on what this framework can do. There are also some tips for performance in the same page, remember to check them too.
+To learn the use of Kingfisher by more examples, take a look at the [Cheat Sheet](https://github.com/onevcat/Kingfisher/wiki/Cheat-Sheet). There we summarized most common tasks in Kingfisher, you can get a better idea on what this framework can do. There are also some tips for performance in the same page, remember to check them too.
 
 ## Requirements