Update README.md

Author: SimonPadbury

README.md

@@ -6,7 +6,8 @@ Designed for static site generators and content management systems, Codebase is
 
 Plus, Codebase pairs well with [AlpineJS](https://alpinejs.dev).
 
-* New in v.5.4: CSS `color-mix(in OKLCH ...)` functions.
+* New in v.5.3.4: focus state styling based on that of the NHS.uk and GOV.UK design systems
+* New in v.5.3: CSS `color-mix(in OKLCH ...)` functions.
 * New in v.5.2: CSS `var()` custom properties.
 
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