test

Allow racc cmdline to read from stdin if no path specified. #76

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	25s
test (2.5, macos-latest)	55s
test (2.5, windows-latest)	2m 13s
test (2.6, ubuntu-latest)	26s
test (2.6, macos-latest)	1m 37s
test (2.6, windows-latest)	2m 47s
test (2.7, ubuntu-latest)	27s
test (2.7, macos-latest)	1m 2s
test (2.7, windows-latest)	1m 49s
test (3.0, ubuntu-latest)	14s
test (3.0, macos-latest)	24s
test (3.0, windows-latest)	1m 11s
test (3.1, ubuntu-latest)	22s
test (3.1, macos-latest)	26s
test (3.1, windows-latest)	1m 24s
test (3.2, ubuntu-latest)	16s
test (3.2, macos-latest)	26s
test (3.2, windows-latest)	1m 55s
test (3.3, ubuntu-latest)	16s
test (3.3, macos-latest)	27s
test (3.3, windows-latest)	2m 5s
test (head, ubuntu-latest)	16s
test (head, macos-latest)	28s
test (head, windows-latest)	1m 8s
test (jruby, ubuntu-latest)	4m 23s
test (jruby-head, ubuntu-latest)	4m 19s
test (truffleruby, ubuntu-latest)	1m 37s
test (truffleruby-head, ubuntu-latest)	1m 51s
	35m 13s

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