Document in CHANGELOG

alphagov · Jul 3, 2018 · f57dd5e · f57dd5e
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 💥 Breaking changes:
 
+- Change Panel component title heading from `h2` to `h1`.
+
+  In most scenarious title will be an `h1` so we're making
+  this the default. You can now specify a heading level
+  by providing `headingLevel: <number>` parameter.
+
+  ([PR #853](https://github.com/alphagov/govuk-frontend/pull/853))
+
 - Pull Request Title goes here
 
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