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readme: update version support matrix #61

Job	Run time
bsd (0.17.0, freebsd)	2m 22s
build (0.15.2, windows-latest)	1m 30s
build (0.16.0, windows-latest)	31s
bsd (0.16.0, freebsd)	1m 29s
build (0.16.0, ubuntu-latest)	47s
build (0.14.1, ubuntu-latest)	37s
bsd (0.17.0, openbsd)	4m 27s
bsd (0.16.0, openbsd)	2m 24s
build (0.17.0, windows-latest)	3m 3s
build (0.14.1, windows-latest)	2m 9s
build (master, ubuntu-latest)	31s
build (0.15.2, ubuntu-latest)	38s
build (0.17.0, ubuntu-latest)	1m 38s
build (master, macos-latest, true)	52s
build (master, windows-latest)	2m 4s
	25m 2s