Bump xterm-addon-unicode11 from 0.5.0 to 0.6.0

Bumps [xterm-addon-unicode11](https://github.com/xtermjs/xterm.js) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/xtermjs/xterm.js/releases)
- [Commits](https://github.com/xtermjs/xterm.js/compare/0.5...0.6)

---
updated-dependencies:
- dependency-name: xterm-addon-unicode11
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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