README.md: fix GitHubActions CI badge (#1199) #870

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Run time

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Job	Run time
3.1	6m 10s
6.0 on Mac-OS	6m 1s
6.0 on Windows NetFramework472	10m 35s
6.0 with netstandard2.0	4m 40s
6.0	5m 2s
	32m 28s