Merge pull request #704 from johnnyshields/fix-truffle-ruby #305

Job	Run time
Unit test (ubuntu-20.04, 3)	30s
Unit test (ubuntu-20.04, 3.1)	23s
rubocop	12s
Unit test (ubuntu-20.04, 3.2)	28s
Unit test (ubuntu-20.04, 3.3)	18s
Unit test (ubuntu-20.04, jruby-9.4)	59s
Unit test (ubuntu-20.04, truffleruby)	1m 57s
Unit test (macos-latest, 3)	21s
Unit test (macos-latest, 3.1)	27s
Unit test (macos-latest, 3.2)	22s
Unit test (macos-latest, 3.3)	24s
Unit test (macos-latest, jruby-9.4)	44s
Unit test (macos-latest, truffleruby)	1m 44s
Unit test (windows-latest, 3)	7m 25s
Unit test (windows-latest, 3.1)	2m 19s
Unit test (windows-latest, 3.2)	1m 59s
Unit test (windows-latest, 3.3)	2m 45s
finish	4s
	23m 21s

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