chore: bump microbundle from 0.12.4 to 0.13.0 (#11)

Bumps [microbundle](https://github.com/developit/microbundle) from 0.12.4 to 0.13.0.
- [Release notes](https://github.com/developit/microbundle/releases)
- [Changelog](https://github.com/developit/microbundle/blob/master/CHANGELOG.md)
- [Commits](developit/microbundle@v0.12.4...v0.13.0)

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