Bump octokit from 3.0.0 to 3.1.0 (#187)

Bumps [octokit](https://github.com/octokit/octokit.js) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/octokit/octokit.js/releases)
- [Commits](octokit/octokit.js@v3.0.0...v3.1.0)

---
updated-dependencies:
- dependency-name: octokit
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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