Bumps json from 2.2.0 to 2.3.0.

Sourced from json's changelog.

2019-12-11 (2.3.0)

• Fix default of create_additions to always be false for JSON(user_input) and JSON.parse(user_input, nil). Note that JSON.load remains with default true and is meant for internal serialization of trusted data. [CVE-2020-10663]
• Fix passing args all #to_json in json/add/*.
• Fix encoding issues
• Fix issues of keyword vs positional parameter
• Fix JSON::Parser against bigdecimal updates
• Bug fixes to JRuby port

• 92cf5c4 v2.3.0
• 579ae85 Add some more recent jruby
• acabfeb Make tests green on jruby
• c194360 Update travis config
• 49317c1 Ignore log files
• d84439f Merge pull request #391 from headius/prep_2.3.0
• 38f68d1 Bump versions for 2.3.0.
• 40524a9 Merge pull request #390 from flori/relax-test-unit
• 87379e6 relax test-unit version for old ruby
• 05de02f Merge branch 'zenspider-zenspider/ruby-2.7'
• Additional commits viewable in compare view

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