Bump makerjs from 0.11.2 to 0.19.2 in /docs/demos (#649)

Bumps [makerjs](https://github.com/Microsoft/maker.js) from 0.11.2 to 0.19.2.
- [Release notes](https://github.com/Microsoft/maker.js/releases)
- [Commits](https://github.com/Microsoft/maker.js/commits)

---
updated-dependencies:
- dependency-name: makerjs
  dependency-version: 0.19.2
  dependency-type: direct:development
...

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