README.md: fix CI status badge #7

Job	Run time
test (0.7, x64, ubuntu-latest)	1m 40s
test (0.7, x64, windows-latest)	3m 57s
test (0.7, x64, macOS-latest)	3m 31s
test (0.7, x86, ubuntu-latest)	2m 6s
test (0.7, x86, windows-latest)	5m 46s
test (1.6, x64, ubuntu-latest)	51s
test (1.6, x64, windows-latest)	8m 27s
test (1.6, x64, macOS-latest)	1m 25s
test (1.6, x86, ubuntu-latest)	59s
test (1.6, x86, windows-latest)	8m 33s
test (1, x64, ubuntu-latest)	1m 11s
test (1, x64, windows-latest)	1m 39s
test (1, x64, macOS-latest)	1m 38s
test (1, x86, ubuntu-latest)	1m 22s
test (1, x86, windows-latest)	2m 33s
test (nightly, x64, ubuntu-latest)	1m 27s
test (nightly, x64, windows-latest)	2m 13s
test (nightly, x64, macOS-latest)	3m 53s
test (nightly, x86, ubuntu-latest)	2m 14s
test (nightly, x86, windows-latest)	5m 23s
	1h 0m 48s

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