Typo fixed for "fixed with" --> "fixed width"

Previously read "You can flip, rotate, or add a fixed with." Should read
"...or add a fixed width."

README.md

@@ -15,7 +15,7 @@ Place the 5 font files and the main `weather-icons.min.css` file in your project
 
 The icons are displayed by using an `i` element and adding the base class `wi` and then the icon class you want, such as `day-sunny`. This then looks like `<i class="wi wi-day-sunny"></i>`.
 
-To add a modifier, include the class you want after the icon name, which looks like `<i class="wi wi-day-sunny wi-flip-vertical"></i>`. You can flip, rotate, or add a fixed with. See it all at [http://weathericons.io](http://weathericons.io).
+To add a modifier, include the class you want after the icon name, which looks like `<i class="wi wi-day-sunny wi-flip-vertical"></i>`. You can flip, rotate, or add a fixed width. See it all at [http://weathericons.io](http://weathericons.io).
 
 ## API Usage