fix readme typo, add memo busting to changelog v4 entry

changelog.md

@@ -10,6 +10,11 @@ on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project ad
 
 > See [migration guide](./migration-guide.md) for upgrading instructions.
 
+### Added
+
+- `tw.memoBuster` property for breaking memoization, [see here](./readme.md#memo-busting)
+  for more details.
+
 ### Fixed
 
 - media-query off by one pixel error

readme.md

@@ -461,8 +461,8 @@ More detailed instructions, including how to add snippets, are available
 
 If you're using device-context prefixes (like `dark:`, and `md:`), _memoized_ components
 can cause problems by preventing re-renders when the color scheme or window size changes.
-You may not be memoizing explicitly yourself as many third-party librarys (like
-`react-navigation`) memoizes its own components.
+You may not be memoizing explicitly yourself as many third-party libraries (like
+`react-navigation`) memoizes their own components.
 
 In order to help with this problem, `twrnc` exposes a `.memoBuster` property on the `tw`
 object. This string property is meant to passed as a `key` prop to break memoization