Update rack requirement from ~> 1.6 to >= 1.6, < 3.0

[dependabot]

Updates the requirements on rack to permit the latest version.

Changelog

Sourced from rack's changelog.

[2.2.3] - 2020-06-15

Security

• [CVE-2020-8184] Do not allow percent-encoded cookie name to override existing cookie names. BREAKING CHANGE: Accessing cookie names that require URL encoding with decoded name no longer works. (@​fletchto99)

[2.2.2] - 2020-02-11

Fixed

• Fix incorrect Rack::Request#host value. (#1591, @​ioquatix)
• Revert Rack::Handler::Thin implementation. (#1583, @​jeremyevans)
• Double assignment is still needed to prevent an "unused variable" warning. (#1589, @​kamipo)
• Fix to handle same_site option for session pool. (#1587, @​kamipo)

[2.2.1] - 2020-02-09

Fixed

• Rework Rack::Request#ip to handle empty forwarded_for. (#1577, @​ioquatix)

[2.2.0] - 2020-02-08

SPEC Changes

• rack.session request environment entry must respond to to_hash and return unfrozen Hash. (@​jeremyevans)
• Request environment cannot be frozen. (@​jeremyevans)
• CGI values in the request environment with non-ASCII characters must use ASCII-8BIT encoding. (@​jeremyevans)
• Improve SPEC/lint relating to SERVER_NAME, SERVER_PORT and HTTP_HOST. (#1561, @​ioquatix)

Added

• rackup supports multiple -r options and will require all arguments. (@​jeremyevans)
• Server supports an array of paths to require for the :require option. (@​khotta)
• Files supports multipart range requests. (@​fatkodima)
• Multipart::UploadedFile supports an IO-like object instead of using the filesystem, using :filename and :io options. (@​jeremyevans)
• Multipart::UploadedFile supports keyword arguments :path, :content_type, and :binary in addition to positional arguments. (@​jeremyevans)
• Static supports a :cascade option for calling the app if there is no matching file. (@​jeremyevans)
• Session::Abstract::SessionHash#dig. (@​jeremyevans)
• Response.[] and MockResponse.[] for creating instances using status, headers, and body. (@​ioquatix)
• Convenient cache and content type methods for Rack::Response. (#1555, @​ioquatix)

Changed

• Request#params no longer rescues EOFError. (@​jeremyevans)
• Directory uses a streaming approach, significantly improving time to first byte for large directories. (@​jeremyevans)
• Directory no longer includes a Parent directory link in the root directory index. (@​jeremyevans)
• QueryParser#parse_nested_query uses original backtrace when reraising exception with new class. (@​jeremyevans)
• ConditionalGet follows RFC 7232 precedence if both If-None-Match and If-Modified-Since headers are provided. (@​jeremyevans)
• .ru files supports the frozen-string-literal magic comment. (@​eregon)

... (truncated)

Commits

• 1741c58 bump version
• 5ccca47 When parsing cookies, only decode the values
• a5e80f0 Bump version.
• b0de37d Remove trailing whitespace.
• 1a784e5 Prepare CHANGELOG for next patch release.
• a0d57d4 Fix to handle same_site option for session pool
• a9b223b Ensure full match. Fixes #1590.
• f4c5645 Double assignment is still needed to prevent an "unused variable" warning
• 5c121dd Revert "Update Thin handler to better handle more options"
• 961d976 Prepare point release.
• Additional commits viewable in compare view

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[dependabot]

A newer version of rack exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.