Bump canvas from 2.11.0 to 2.11.2 (#58)

Bumps [canvas](https://github.com/Automattic/node-canvas) from 2.11.0 to 2.11.2.
- [Release notes](https://github.com/Automattic/node-canvas/releases)
- [Changelog](https://github.com/Automattic/node-canvas/blob/master/CHANGELOG.md)
- [Commits](Automattic/node-canvas@v2.11.0...v2.11.2)

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

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