README.md: Fix link to Github Actions CI badge #39

Job	Run time
test (stable minus 15 releases)	2m 56s
test (stable minus 15 releases, nested-values)	2m 45s
test (stable minus 15 releases, dynamic-keys)	2m 44s
test (stable minus 15 releases, nothreads)	2m 30s
test (stable minus 15 releases, nested-values dynamic-keys)	3m 23s
test (stable minus 15 releases, nested-values dynamic-keys nothreads)	2m 47s
test (1.56)	2m 47s
test (1.56, nested-values)	3m 20s
test (1.56, dynamic-keys)	2m 56s
test (1.56, nothreads)	2m 57s
test (1.56, nested-values dynamic-keys)	3m 26s
test (1.56, nested-values dynamic-keys nothreads)	3m 36s
test (1.72)	23s
test (1.72, nested-values)	28s
test (1.72, dynamic-keys)	23s
test (1.72, nothreads)	17s
test (1.72, nested-values dynamic-keys)	41s
test (1.72, nested-values dynamic-keys nothreads)	31s
test (stable)	26s
test (stable, nested-values)	22s
test (stable, dynamic-keys)	26s
test (stable, nothreads)	23s
test (stable, nested-values dynamic-keys)	28s
test (stable, nested-values dynamic-keys nothreads)	34s
test (nightly)	20s
test (nightly, nested-values)	35s
test (nightly, dynamic-keys)	19s
test (nightly, nothreads)	20s
test (nightly, nested-values dynamic-keys)	31s
test (nightly, nested-values dynamic-keys nothreads)	26s
test (1.49)	2m 28s
test (1.49, dynamic-keys)	2m 52s
test (1.49, nothreads)	2m 34s
test (1.49, nothreads dynamic-keys)	2m 49s
	54m 43s

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