Fix docs #268

Job	Run time
test (1.6, ubuntu-latest, x86)	4m 46s
test (1.6, ubuntu-latest, x64)	10m 11s
test (1.6, macOS-latest, x64)	4m 22s
test (1.6, windows-latest, x86)	13m 39s
test (1.6, windows-latest, x64)	11m 47s
test (1, ubuntu-latest, x86)	3m 45s
test (1, ubuntu-latest, x64)	3m 56s
test (1, macOS-latest, x64)	4m 22s
test (1, windows-latest, x86)	6m 47s
test (1, windows-latest, x64)	5m 56s
test (nightly, ubuntu-latest, x86)	4m 56s
test (nightly, ubuntu-latest, x64)	4m 46s
test (nightly, macOS-latest, x64)	4m 28s
test (nightly, windows-latest, x86)	8m 51s
test (nightly, windows-latest, x64)	5m 44s
	1h 38m 16s

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