Fix pluralisation in progress message (#151) #381

Job	Run time
test (1.6, ubuntu-latest, x86, 1)	6m 41s
test (1.6, ubuntu-latest, x64, 1)	4m 54s
test (1.6, macOS-latest, x64, 1)	6m 50s
test (1.6, windows-latest, x64, 1)	6m 59s
test (1, ubuntu-latest, x86, 1)	7m 5s
test (1, ubuntu-latest, x86, 2)	6m 47s
test (1, ubuntu-latest, x64, 1)	6m 22s
test (1, ubuntu-latest, x64, 2)	5m 48s
test (1, macOS-latest, x64, 1)	6m 51s
test (1, macOS-latest, x64, 2)	6m 46s
test (1, windows-latest, x64, 1)	6m 47s
test (1, windows-latest, x64, 2)	6m 47s
test (nightly, ubuntu-latest, x86, 1)	7m 4s
test (nightly, ubuntu-latest, x86, 2)	6m 51s
test (nightly, ubuntu-latest, x64, 1)	5m 36s
test (nightly, ubuntu-latest, x64, 2)	5m 38s
test (nightly, macOS-latest, x64, 1)	6m 50s
test (nightly, macOS-latest, x64, 2)	6m 51s
test (nightly, windows-latest, x64, 1)	6m 43s
test (nightly, windows-latest, x64, 2)	6m 42s
	2h 10m 52s

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