test

Bump up 3.1.0 #169

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5 / ubuntu-latest)	14s
build (2.5 / macos-latest)	7s
build (2.5 / windows-latest)	11s
build (2.6 / ubuntu-latest)	11s
build (2.6 / macos-latest)	12s
build (2.6 / windows-latest)	10s
build (2.7 / ubuntu-latest)	10s
build (2.7 / macos-latest)	12s
build (2.7 / windows-latest)	11s
build (3.0 / ubuntu-latest)	13s
build (3.0 / macos-latest)	17s
build (3.0 / windows-latest)	10s
build (3.1 / ubuntu-latest)	14s
build (3.1 / macos-latest)	10s
build (3.1 / windows-latest)	9s
build (3.2 / ubuntu-latest)	13s
build (3.2 / macos-latest)	11s
build (3.2 / windows-latest)	11s
build (3.3 / ubuntu-latest)	12s
build (3.3 / macos-latest)	15s
build (3.3 / windows-latest)	12s
build (head / ubuntu-latest)	13s
build (head / macos-latest)	8s
build (truffleruby-head / ubuntu-latest)	10s
build (truffleruby-head / macos-latest)	10s
build (mswin / windows-latest)	11s
build (mingw / windows-latest)	8s
	5m 9s

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