Merge pull request #634 from sparklemotion/flavorjones-dep-nkf #190

Job	Run time
rubocop	15s
test (2.6)	25s
test (2.7)	24s
test-platform (windows-latest)	2m 19s
test (3.0)	12s
test-platform (macos-latest)	28s
test (3.1)	13s
test (3.2)	14s
test (3.3)	13s
test (jruby-9.4)	55s
test (truffleruby)	2m 4s
test (head)	18s
test (jruby-head)	1m 5s
test (truffleruby-head)	55s
	10m 0s

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