Bump pwacompat from 2.0.15 to 2.0.16 (#2067)
Bumps [pwacompat](https://github.com/GoogleChrome/pwacompat) from 2.0.15 to 2.0.16.
- [Release notes](https://github.com/GoogleChrome/pwacompat/releases)
- [Commits](https://github.com/GoogleChrome/pwacompat/compare/v2.0.15...v2.0.16)
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