Bump json from 1.6.4 to 1.8.6 in /mailit

[dependabot]

Bumps json from 1.6.4 to 1.8.6.

Changelog

Sourced from json's changelog.

2017-01-13 (1.8.6)

• Be compatible with ancient ruby 1.8 (maybe?)
  2015-09-11 (1.8.5)
• Be compatible with ruby 2.4.0
• There were still some mentions of dual GPL licensing in the source, but JSON
  has just the Ruby license that itself includes an explicit dual-licensing
  clause that allows covered software to be distributed under the terms of
  the Simplified BSD License instead for all ruby versions >= 1.9.3. This is
  however a GPL compatible license according to the Free Software Foundation.
  I changed these mentions to be consistent with the Ruby license setting in
  the gemspec files which were already correct now.
  ---------- (1.8.4) Skipped.
  2015-06-01 (1.8.3)
• Fix potential memory leak, thx to nobu.
  2015-01-08 (1.8.2)
• Some performance improvements by Vipul A M [email protected].
• Fix by Jason R. Clark [email protected] to avoid mutation of
  JSON.dump_default_options.
• More tests by Michael Mac-Vicar [email protected] and fixing
  space_before accessor in generator.
• Performance on Jruby improvemed by Ben Browning [email protected].
• Some fixes to be compatible with the new Ruby 2.2 by Zachary Scott [email protected]
  and SHIBATA Hiroshi [email protected].
  2013-05-13 (1.8.1)
• Remove Rubinius exception since transcoding should be working now.
  2013-05-13 (1.8.0)
• Fix flori/json#162 reported by Marc-Andre
  Lafortune [email protected]. Thanks!
• Applied patches by Yui NARUSE [email protected] to suppress warning with
  -Wchar-subscripts and better validate UTF-8 strings.
• Applied patch by ginriki@github to remove unnecessary if.
• Add load/dump interface to JSON::GenericObject to make
  serialize :some_attribute, JSON::GenericObject
  work in Rails active models for convenient SomeModel#some_attribute.foo.bar
  access to serialised JSON data.
  2013-02-04 (1.7.7)
• Security fix for JSON create_additions default value and
  JSON::GenericObject. It should not be possible to create additions unless
  explicitely requested by setting the create_additions argument to true or
  using the JSON.load/dump interface. If JSON::GenericObject is supposed to
  be automatically deserialised, this has to be explicitely enabled by
  setting
  JSON::GenericObject.json_creatable = true
  as well.
• Remove useless assert in fbuffer implementation.
• Apply patch attached to https://github.com/flori/json/issues#issue/155
  provided by John Shahid [email protected], Thx!
• Add license information to rubygems spec data, reported by Jordi Massaguer Pla [email protected].
• Improve documentation, thx to Zachary Scott [email protected].
  2012-11-29 (1.7.6)

... (truncated)

Commits

• 7f4cfd8 Try to be compatible with ruby 1.8
• 4cf6c62 Update gemspecs
• 48c5e99 Stop testing on 1.8, it might work though
• 5d46fb9 Travis don't know how to build these rubies
• 7f05140 Fix conversion crash on 1.9
• 2bcacc1 Require ruby version 2.0 or better
• f8e2aa6 Reduce supported ruby versions
• b4eeed1 Test newer rubies
• c7a6e31 Use 2.3.1 for testing
• 953f474 Merge RUBY_INTEGER_UNIFICATION changes
• 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.