Prepare to release Ruby 3.0#457

Merged

hsbt merged 13 commits intomasterfrom

Dec 22, 2020

Commits on Dec 22, 2020

[json] Stop using prototype objects

mrkn
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hsbt
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[json] Make JSON.create_id thread-safe

mrkn
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hsbt
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[json] JSON_parse_float: Fix how to convert number

mrkn
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hsbt
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[json] Make json Ractor safe

mrkn
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hsbt
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[json] Avoid method redefinition

mrkn
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hsbt
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Import test assertions from ruby/ruby
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skip ractor_test with JRuby
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Change the condition for Ractor
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Use 2.7 in Travis
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Guard for Ruby 3.0
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Skip tests with JRuby platform
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Drop to tests with too old Ruby
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Workaround for JRuby
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