CHANGELOG.md in govuk_tech_docs-3.4.5 vs CHANGELOG.md in govuk_tech_docs-3.5.0

- old
+ new

@@ -1,6 +1,8 @@
 # Changelog
 
+## Unreleased
+
 ## 3.5.0
 
 ### New features
 
 - Update the Crown logo and govuk-frontend