Allow QuickCheck 2.15 #25

Job	Run time
arm (arm32v7)	16s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	5m 59s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	6h 0m 17s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	5m 54s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	20m 13s
arm (arm64v8)	15s
build (ubuntu-latest, 8.6, 3.8.1.0)	11m 29s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	36m 3s
build (ubuntu-latest, 8.8, 3.8.1.0)	10m 56s
i386	10m 21s
build (ubuntu-latest, 8.10, 3.8.1.0)	9m 46s
build (ubuntu-latest, 9.0, 3.8.1.0)	10m 52s
build (ubuntu-latest, 9.2, 3.8.1.0)	10m 32s
build (ubuntu-latest, 9.4, 3.8.1.0)	14m 10s
build (ubuntu-latest, 9.6, 3.8.1.0)	11m 20s
build (ubuntu-latest, 9.8, 3.8.1.0)	9m 48s
build (macOS-latest, 9.4, 3.8.1.0)	6h 0m 15s
build (macOS-latest, 9.6, 3.8.1.0)	40m 19s
build (windows-latest, 9.4, 3.8.1.0)	1h 20m 58s
build (windows-latest, 9.6, 3.8.1.0)	48m 46s
	17h 38m 29s

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