test

Add 'digest' option #210

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5 / ubuntu-latest)	20s
build (2.5 / windows-latest)	3m 45s
build (2.6 / ubuntu-latest)	22s
build (2.6 / macos-latest)	44s
build (2.6 / windows-latest)	2m 35s
build (2.7 / ubuntu-latest)	21s
build (2.7 / macos-latest)	26s
build (2.7 / windows-latest)	3m 29s
build (3.0 / ubuntu-latest)	7s
build (3.0 / macos-latest)	11s
build (3.0 / windows-latest)	1m 44s
build (3.1 / ubuntu-latest)	9s
build (3.1 / macos-latest)	13s
build (3.1 / windows-latest)	1m 32s
build (3.2 / ubuntu-latest)	8s
build (3.2 / macos-latest)	10s
build (3.2 / windows-latest)	2m 35s
build (3.3 / ubuntu-latest)	11s
build (3.3 / macos-latest)	10s
build (3.3 / windows-latest)	1m 21s
build (3.4 / ubuntu-latest)	8s
build (3.4 / macos-latest)	11s
build (3.4 / windows-latest)	2m 0s
build (head / ubuntu-latest)	6s
build (head / macos-latest)	12s
build (jruby / ubuntu-latest)	43s
build (jruby-head / ubuntu-latest)	41s
build (truffleruby / ubuntu-latest)	22s
build (truffleruby / macos-latest)	20s
build (truffleruby-head / ubuntu-latest)	26s
build (truffleruby-head / macos-latest)	17s
build (mingw / windows-latest)	1m 21s
build (mswin / windows-latest)	1m 55s
	29m 19s

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