Update faraday requirement from ~> 0.9.0 to >= 0.9, < 0.18

[dependabot-preview]

Updates the requirements on faraday to permit the latest version.

Release notes

Sourced from faraday's releases.

Faraday v0.17.0

ATTENTION: This is a ROLLBACK RELEASE!

We apologise for the issues created by the v0.16.x release series, these were due to the Faraday team underestimating the latest changes applied to master since v0.15.4 (November 2018).
The v0.16.0 -> v0.16.2 releases will be removed from Rubygems and all changes contained in master will be released as v1.0.

v0.17.x will continue from where v0.15.4 left so it will not give any backwards-incompatible issues like the v0.16.x series did.

Extra Note: some gems using Faraday may keep a cache of request/responses data. We suggest you to clear any cache related to Faraday requests after upgrading to v0.17.0 (e.g. https://github-redirect.dependabot.com/github-changelog-generator/github-changelog-generator/issues/738#issuecomment-538931022)

Diff from v0.15.4

• Include instructions for using custom middleware (#836)
• Travis: add 2.6.0 to CI matrix, remove sudo: false (#839)
• Explicitly require date for DateTime (#844)
• README: Travis build badge for branch master (#849)

Changelog

Sourced from faraday's changelog.

Faraday Changelog

For newer changes, please see https://github.com/lostisland/faraday/releases

v0.9.1

• Refactor Net:HTTP adapter so that with_net_http_connection can be overridden to allow pooled connections. (@​Ben-M)
• Add configurable methods that bypass retry_if in the Retry request middleware. (@​mike-bourgeous)

v0.9.0

• Add HTTPClient adapter (@​hakanensari)
• Improve Retry handler (@​mislav)
• Remove autoloading by default (@​technoweenie)
• Improve internal docs (@​technoweenie, @​mislav)
• Respect user/password in http proxy string (@​mislav)
• Adapter options are structs. Reinforces consistent options across adapters
  (@​technoweenie)
• Stop stripping trailing / off base URLs in a Faraday::Connection. (@​technoweenie)
• Add a configurable URI parser. (@​technoweenie)
• Remove need to manually autoload when using the authorization header helpers on Faraday::Connection. (@​technoweenie)
• Faraday::Adapter::Test respects the Faraday::RequestOptions#params_encoder option. (@​technoweenie)

Commits

• 22b689d Version bump to 0.17.0 (rolling back 0.16.0 -> 0.16.2 releases from master).
• 9307883 Version bump to 0.16.3 (rolling back 0.16.0 -> 0.16.2 releases from master).
• 5637812 README: Travis build badge for branch master (#849)
• 6f2ae82 Explicitly require date for DateTime (#844)
• c80cf86 Travis: add 2.6.0 to CI matrix, remove sudo: false (#839)
• 6cba2a8 Include instructions for using custom middleware (#836)
• 1db9340 Version bump to 0.15.4
• f18a248 Expose pool_size as a option for the NetHttpPersistent adapter (#834)
• 88de44e Fix label name for contributing
• 81274c9 Version bump to 0.15.3
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #73.