Bump rollup from 2.78.0 to 2.78.1 (lukasoppermann#909)

Bumps [rollup](https://github.com/rollup/rollup) from 2.78.0 to 2.78.1.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.78.0...v2.78.1)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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