Upgrade json to version 2.3.0

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Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ json (~> 1.8 → ~> 2.3) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 53 commits:

• v2.3.0
• Add some more recent jruby
• Make tests green on jruby
• Update travis config
• Ignore log files
• Merge pull request #391 from headius/prep_2.3.0
• Bump versions for 2.3.0.
• Merge pull request #390 from flori/relax-test-unit
• relax test-unit version for old ruby
• Merge branch 'zenspider-zenspider/ruby-2.7'
• Merge branch 'zenspider/ruby-2.7' of https://github.com/zenspider/json into zenspider-zenspider/ruby-2.7
• Merge pull request #388 from flori/backport-ruby-core
• Skip useless test
• Bump to test-unit 3 to get warnings cleaned up.
• Fix warning from trying to access an uninitialized ivar.
• Fix syntax warnings from tests.
• Minor cleanup for ruby 2.7 warnings and failures.
• Removed duplicate file
• Add NaN / Infinity / MinusInfinity to mark list
• ext/json/parser/prereq.mk: Add a "automatically generated" header
• ext/json/parser/parser.rl: Use "signed" char to contain negative values
• Add `GC.compact` again.
• ext/json/parser/parser.rl: Update the source code of parser.c
• Suppress uninitialized instance variable warnings
• Removed useless `freeze`s from gemspec files
• Drop fossil rubygems support
• Removed binary line
• Fix JSON::Parser against bigdecimal updates
• [flori/json] Fixed unexpected illegal/malformed utf-8 error
• Ignore warnings about ambiguous first argument of regexp with assert match.
• Make rb_scan_args handle keywords more similar to Ruby methods (#2460)
• Ignore warnings about ambiguous first argument with the negative integer.
• Remove unused constant.
• Look up constant instead of caching in a global
• Merge pull request #381 from olleolleolle/patch-1
• Gemspec: Drop EOL'd property rubyforge_project
• Recreate gemspecs
• Merge pull request #367 from sho-h/add-ascii_only-document
• Merge pull request #378 from olleolleolle/patch-1
• Remove RubyForge homepage reference
• Use newest rubygems
• Pass args all #to_json in json/add/*.
• Add LICENSE file
• Merge branch 'master' of github.com:flori/json
• Does not check whether illegal utf-8 if string has ascii only.
• Convert string encoding to UTF-8 only when needed
• Convert String encoding using `rb_str_encode()`
• Add shortcut converting to String
• Convert Hash object using rb_hash_foreach()
• Only attempt to resize strings not other objects
• Test on newer rubies
• Merge pull request #376 from olleolleolle/patch-1
• README: Docs at rubydoc.info, not on rubyforge

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Closed in favor of #20.