Update changelog

CHANGELOG.md

@@ -4,6 +4,15 @@
 
 ### Fixes
 
+We've made the following fixes in [pull request #2577: Refactor character count to inject new element](https://github.com/alphagov/govuk-frontend/pull/2577):
+
+- fix character count message being repeated twice by screen readers
+- fix character count hint text being announced as part of the count message
+- fix multiple outdated character count messages being announced at once
+- fix character count message being announced when input length is below a defined threshold
+
+We’ve also made fixes in the following pull requests:
+
 - [#2549: Fix header with product name focus and hover state length](https://github.com/alphagov/govuk-frontend/pull/2549)
 - [#2573: Better handle cases where govuk-text-colour is set to a non-colour value](https://github.com/alphagov/govuk-frontend/pull/2573)