docs: fix typo (#67)

Author: Roman Rokon

README.md

@@ -117,7 +117,7 @@ toBeDisabled();
 Check whether or not an element is disabled from a user perspective.
 
 This matcher will check if the element or its parent has a `disabled` prop, or if it has
-`accessibilityState={{disabled: true]}.
+`accessibilityState={{disabled: true}}.
 
 It also works with `accessibilityStates={['disabled']}` for now. However, this prop is deprecated in
 React Native [0.62](https://reactnative.dev/blog/2020/03/26/version-0.62#breaking-changes)