Merge pull request #167 from ybiquitous/patch-1 #39

Job	Run time
test (ubuntu-latest, 2.5)	22s
test (ubuntu-latest, 2.6)	27s
test (ubuntu-latest, 2.7)	24s
test (ubuntu-latest, 3.0)	10s
test (ubuntu-latest, 3.1)	12s
test (ubuntu-latest, 3.2)	11s
test (ubuntu-latest, head)	9s
test (ubuntu-latest, debug)	35s
test (ubuntu-latest, truffleruby)	35s
test (ubuntu-latest, truffleruby-head)	1m 4s
test (ubuntu-latest, jruby)	45s
test (ubuntu-latest, jruby-head)	46s
test (macos-latest, 2.5)	55s
test (macos-latest, 2.6)	1m 13s
test (macos-latest, 2.7)	1m 7s
test (macos-latest, 3.0)	16s
test (macos-latest, 3.1)	15s
test (macos-latest, 3.2)	38s
test (macos-latest, head)	22s
test (macos-latest, debug)	54s
test (macos-latest, truffleruby)	58s
test (macos-latest, truffleruby-head)	1m 25s
test (macos-latest, jruby)	1m 59s
test (macos-latest, jruby-head)	53s
coveralls	4s
	16m 39s

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