Bump version to 0.2.18 #144

Job	Run time
linux (x86_64)	1m 10s
linux (i686)	1m 26s
macos	1m 11s
linux-cross (aarch64)	4m 6s
musllinux (x86_64-unknown-linux-musl)	1m 10s
linux-cross (armv7)	3m 38s
musllinux (i686-unknown-linux-musl)	53s
windows (x64)	1m 24s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 40s
linux-cross (s390x)	3m 55s
windows (x86)	1m 36s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 39s
linux-cross (ppc64le)	3m 48s
linux-cross (ppc64)	1m 47s
Release	0s
	29m 23s

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