Fix one README example that were broken by https://github.com/dart-la… #836

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Run time

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Job	Run time
format	18s
analyze (3.3.0)	1m 0s
analyze (dev)	57s
test (ubuntu-latest, 3.3.0)	6h 5m 0s
test (ubuntu-latest, dev)	6h 5m 0s
document (ubuntu-latest)	37s
	12h 12m 52s