chore(deps): bump @jspm/generator from 2.3.0 to 2.3.1 (#2580)

Bumps [@jspm/generator](https://github.com/jspm/generator) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/jspm/generator/releases)
- [Commits](jspm/generator@2.3.0...2.3.1)

---
updated-dependencies:
- dependency-name: "@jspm/generator"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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