Fix typo in docs

README.md

@@ -75,7 +75,7 @@ Every event callback has a parameter of `Typist.KeyboardOptions` type. It is an
 * **`endFrame`** — `CGRect` that identifies the end frame of the keyboard in screen coordinates. These coordinates do not take into account any rotation factors applied to the view’s contents as a result of interface orientation changes. Thus, you may need to convert the rectangle to view coordinates (using the `convert(CGRect, from: UIView?)` method) before using it.
 * **`animationCurve`** — `UIView.AnimationCurve` constant that defines how the keyboard will be animated onto or off the screen.
 * **`animationDuration`** — `Double` that identifies the duration of the animation in seconds.
-* **`animationOptions`** — `UIView.AnimationOptions` helper property that maps the `animationCurve` to it's respective `UIView.AnimationOptions` value. Usefull when performming view animations using `UIView.animate(...`.  
+* **`animationOptions`** — `UIView.AnimationOptions` helper property that maps the `animationCurve` to its respective `UIView.AnimationOptions` value. Usefull when performming view animations using `UIView.animate(...`.  
 
 ### Events