Release v2.4.0 · ruby/json

What's Changed

Move options from #generate and #parse to common area by @BurdetteLamar in #430
Do not add a relative path to $LOAD_PATH by @mame in #431
test/json/json_fixtures_test.rb: Prevent an "out of range" warning by @mame in #432
Enhance RDoc for JSON.parse by @BurdetteLamar in #433
[CI] setup supported JRubies to test against by @kares in #372
Fixed unexpected illegal/malformed utf-8 error by @nobu in #385
RDoc example for JSON.load by @BurdetteLamar in #434
unify json-java gemspec with the baseline by @kares in #435
[test] properly 'skip' test on JRuby by @kares in #436
RDoc for JSON.load with proc by @BurdetteLamar in #439
Nodoc for recurse_proc by @BurdetteLamar in #442
Add an option to escape forward slash character by @casperisfine in #405
bundle the LICENSE file in the gem by @jfeltesse-mdsol in #444
Enhanced RDoc for JSON.dump by @BurdetteLamar in #443
Fix pure parser with unclosed arrays / objects [Fix #314] by @marcandre in #425
Partial compliance with doc/method_documentation.rdoc by @BurdetteLamar in #446
Fix JSON.load_file doc by @casperisfine in #448
Fix an issue with generate_pretty and empty objects in the Ruby and Java implementations by @chrisseaton in #449
Implement a freeze: parser option by @casperisfine in #447
Backport ruby core by @hsbt in #450

Full Changelog: v2.3.1...v2.4.0