Add changelog

CHANGELOG.md

@@ -12,6 +12,12 @@ This will help with scenarios where some of the elements, such as navigation and
 
 - [Pull request #1576: Allow `lang` to be set on title and main of template](https://github.com/alphagov/govuk-frontend/pull/1576).
 
+#### Visual updates to the warning text component
+
+Align ‘Warning text’ icon with first line of the content fixing [#1352](https://github.com/alphagov/govuk-frontend/issues/1352) Some changes were made to the size and spacing of the icon to help with positioning.
+
+- [Pull request #1578: Change position and spacing relationship of warning text icon](https://github.com/alphagov/govuk-frontend/pull/1578)
+
 ### Fixes
 - [Pull request #1574: Make form elements scale correctly when text resized by user](https://github.com/alphagov/govuk-frontend/pull/1574).
 - [Pull request #1584: Fix text resize issue with warning text icon](https://github.com/alphagov/govuk-frontend/pull/1584)