Bump up v1.7.1 #337

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	43s
test (2.5, macos-latest)	1m 21s
test (2.5, windows-latest)	4m 18s
test (2.6, ubuntu-latest)	40s
test (2.6, macos-latest)	2m 50s
test (2.6, windows-latest)	5m 32s
test (2.7, ubuntu-latest)	38s
test (2.7, macos-latest)	1m 18s
test (2.7, windows-latest)	3m 3s
test (3.0, ubuntu-latest)	24s
test (3.0, macos-latest)	54s
test (3.0, windows-latest)	2m 18s
test (3.1, ubuntu-latest)	25s
test (3.1, macos-latest)	53s
test (3.1, windows-latest)	1m 56s
test (3.2, ubuntu-latest)	25s
test (3.2, macos-latest)	50s
test (3.2, windows-latest)	2m 57s
test (head, ubuntu-latest)	27s
test (head, macos-latest)	2m 29s
test (head, windows-latest)	2m 36s
test (jruby, ubuntu-latest)	7m 22s
test (jruby-head, ubuntu-latest)	6m 20s
test (truffleruby, ubuntu-latest)	3m 45s
test (truffleruby-head, ubuntu-latest)	4m 53s
	59m 19s

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