test

Test Travis CI. #116

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.7 / ubuntu-latest)	30s
build (2.7 / macos-latest)	1m 3s
build (2.7 / windows-latest)	2m 2s
build (3.0 / ubuntu-latest)	17s
build (3.0 / macos-latest)	42s
build (3.0 / windows-latest)	1m 41s
build (3.1 / ubuntu-latest)	18s
build (3.1 / macos-latest)	38s
build (3.1 / windows-latest)	1m 30s
build (3.2 / ubuntu-latest)	23s
build (3.2 / macos-latest)	26s
build (3.2 / windows-latest)	4m 42s
build (head / ubuntu-latest)	13s
build (head / macos-latest)	31s
build (truffleruby-head / ubuntu-latest)	52s
build (truffleruby-head / macos-latest)	1m 18s
build (mswin / windows-latest)	2m 12s
build (mingw / windows-latest)	1m 56s
	21m 17s

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