dependabot/bundler/rack-2.2.3 Bump rack from 2.0.8 to 2.2.3

Bumps [rack](https://github.com/rack/rack) from 2.0.8 to 2.2.3.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/2.0.8...2.2.3)

Signed-off-by: dependabot[bot] <support@github.com>

dependabot[bot] authored GitHub committed

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travis-ci/travis-sso:.travis.yml@5c4ac91
language: ruby
Build Config
{
  "language": "ruby",
  "os": [
    "linux"
  ],
  "dist": "xenial"
}