dependabot/bundler/rack-2.0.7 Bump rack from 2.0.5 to 2.0.7

Bumps [rack](https://github.com/rack/rack) from 2.0.5 to 2.0.7.
- [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/2.0.5...2.0.7)

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

dependabot[bot] authored GitHub committed

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travis-ci/travis-sso:.travis.yml@44e9e51
language: ruby
Build Config
{
  "os": [
    "linux"
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  "language": "ruby"
}