CompatHelper: bump compat for BangBang to 0.4, (keep existing compat) #272

Job	Run time
test (1.6, ubuntu-latest, x86, 1)	4m 36s
test (1.6, ubuntu-latest, x64, 1)	2m 41s
test (1.6, macOS-latest, x64, 1)	4m 5s
test (1.6, windows-latest, x64, 1)	10m 40s
test (1, ubuntu-latest, x86, 1)	28m 31s
test (1, ubuntu-latest, x86, 2)	28m 30s
test (1, ubuntu-latest, x64, 1)	2m 52s
test (1, ubuntu-latest, x64, 2)	2m 31s
test (1, macOS-latest, x64, 1)	5m 10s
test (1, macOS-latest, x64, 2)	4m 35s
test (1, windows-latest, x64, 1)	3m 25s
test (1, windows-latest, x64, 2)	3m 37s
test (nightly, ubuntu-latest, x86, 1)	6m 22s
test (nightly, ubuntu-latest, x86, 2)	5m 57s
test (nightly, ubuntu-latest, x64, 1)	3m 22s
test (nightly, ubuntu-latest, x64, 2)	3m 18s
test (nightly, macOS-latest, x64, 1)	11m 8s
test (nightly, macOS-latest, x64, 2)	7m 25s
test (nightly, windows-latest, x64, 1)	4m 33s
test (nightly, windows-latest, x64, 2)	4m 26s
	2h 27m 44s

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