Overview of changes in Metropolis 1.1
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* New features:

- Support backup slides
- Support for subsections
- Add standout frame key for standout slides

* Bugs fixed:

- Avoid justification of title in section pages.
- Improve frame title with new struts
- Fix multi-line block titles
- Ensure consistent line height
- Known issue with beamercolortheme fly
- Do not increase frame number for section and titlepage