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Breaking changes:
- Use ``plone.base``, black, isort. [maurits] (302)
New features:
- Reimplement dropout toolbar submenus and collapsed icons.
[petschki, agitator] (303)
Bug fixes:
- Display all the creators if they are more than one.
Make the byline and the contributor viewlet markup consistent.
[ale-rt] (304)
- Deprecate unused code [ale-rt] (305)
- Remove alt tags from icons within links.
[agitator] (309)