Improve README #110

Job	Run time
macos	2m 22s
linux-cross (aarch64)	3m 37s
linux (x86_64)	1m 31s
linux-cross (armv7)	3m 51s
musllinux (x86_64-unknown-linux-musl)	1m 8s
linux-cross (s390x)	3m 30s
musllinux (i686-unknown-linux-musl)	1m 13s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 48s
linux-cross (ppc64le)	3m 46s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	2m 3s
linux (i686)	1m 29s
linux-cross (ppc64)	1m 46s
windows (x64)	1m 30s
windows (x86)	1m 48s
Release	0s
	31m 22s

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