Overview of changes in Metropolis 1.2

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* New features:

- Added a highcontrast color theme

* Bugs fixed:

- Fixed issues with Beamer 3.37+

- Fix the "Overfull \hbox (0.4pt too wide)" bug when using progress bar.

- Only load fontspec if it’s not loaded

- Fix problem w/ inverting colours mid-presentation

- Use sectiontitleformat for subsection title

- Fix empty second line in certain frametitles

- Fixed #206, #214, #216

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