Fix pluralisation in progress message #379

Job	Run time
test (1.6, ubuntu-latest, x86, 1)	6m 54s
test (1.6, ubuntu-latest, x64, 1)	4m 51s
test (1.6, macOS-latest, x64, 1)	5m 55s
test (1.6, windows-latest, x64, 1)	15m 34s
test (1, ubuntu-latest, x86, 1)	6h 0m 15s
test (1, ubuntu-latest, x86, 2)	6h 0m 16s
test (1, ubuntu-latest, x64, 1)	6m 24s
test (1, ubuntu-latest, x64, 2)	6m 6s
test (1, macOS-latest, x64, 1)	6m 42s
test (1, macOS-latest, x64, 2)	7m 59s
test (1, windows-latest, x64, 1)	6m 55s
test (1, windows-latest, x64, 2)	7m 11s
test (nightly, ubuntu-latest, x86, 1)	8m 23s
test (nightly, ubuntu-latest, x86, 2)	7m 23s
test (nightly, ubuntu-latest, x64, 1)	5m 41s
test (nightly, ubuntu-latest, x64, 2)	5m 31s
test (nightly, macOS-latest, x64, 1)	6m 37s
test (nightly, macOS-latest, x64, 2)	7m 48s
test (nightly, windows-latest, x64, 1)	6m 26s
test (nightly, windows-latest, x64, 2)	6m 31s
	14h 9m 22s

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