Update http requirement from = 0.5.0 to = 4.0.0

[dependabot]

Updates the requirements on http to permit the latest version.

Changelog

Sourced from http's changelog.

4.0.0 (2018-10-15)

• #482
  #499
  Introduce new features injection API with 2 new feaures: instrumentation
  (compatible with ActiveSupport::Notification) and logging.
  ([@​paul])

• #473
  Handle early responses.
  ([@​janko-m])

• #468
  Rewind HTTP::Request::Body#source once #each is complete.
  ([@​ixti])

• #467
  Drop Ruby 2.2 support.
  ([@​ixti])

• #436
  Raise ConnectionError when writing to socket fails.
  ([@​janko-m])

• #438
  Expose HTTP::Request::Body#source.
  ([@​janko-m])

• #446
  Simplify setting a timeout.
  ([@​mikegee])

• #451
  Reduce memory usage when reading response body.
  ([@​janko-m])

• #458
  Extract HTTP::Client#build_request method.
  ([@​tycoon])

• #462
  Fix HTTP::Request#headline to allow two leading slashes in path.
  ([@​scarfacedeb])

• #454
  #464
  #384
  Fix #readpartial not respecting max length argument.
  ([@​janko-m], [@​marshall-lee])

... (truncated)

Commits

• 2dd9161 Release v4.0.0
• 7c2a861 Fix rubocop issues because a line moved
• 648f4b3 Make feature load-order less janky
• 18c856c Add AS::Notifications-compatible instrument feature
• 8514b41 Add a logging feature
• 6099c74 Add a mechanism to register new features
• da68f40 Merge pull request #482 from paul/feature/generic-features
• 5ff08ae CompressedBody works just like a regular Request::Body
• 539409c Refactor AutoInflate/Deflate into generic features
• 6766730 README.md: Add more obvious 'Documentation' link
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the Security Alerts page.