README: small touch-ups #165

Job	Run time
Golang-CI Lint (ubuntu-latest)	28s
Cross (stable, ubuntu-latest)	1m 34s
Unit test (stable, macos-latest)	27s
Unit test (stable, ubuntu-latest)	36s
Unit test (stable, windows-latest)	1m 19s
Unit test (1.17.x, ubuntu-latest)	19s
Unit test (oldstable, macos-latest)	29s
Unit test (oldstable, ubuntu-latest)	36s
Unit test (1.17.x, windows-latest)	40s
Unit test (1.17.x, macos-latest)	28s
Unit test (oldstable, windows-latest)	1m 52s
	8m 48s

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