add: changelog notes (#25)

CHANGELOG.md

@@ -23,12 +23,14 @@ Prefix the change with one of these keywords:
 - Styles for invalid block wrapper
 - Check core heading block to prevent publishing with an H1 in the content
 - Check core table block to prevent publishing when a header row is not being used
+- Check core image for alternative text
+- Add attritbute to image block to confirm decorative image to bypass a11y error
 - Instructions on setting up to run and build the plugin
 - Getting involved instructions in the README
 - Husky pre-commit check
 - Commit lint and rules
 - Git action to run build on PR to develop
-- Git issue templates to log features and tasks
+- Git issue and PR templates to log features and tasks
 
 ## [0.1.0]