Bump version to 0.2.15 #116

Job	Run time
linux (x86_64)	1m 16s
linux (i686)	1m 35s
linux-cross (aarch64)	3m 45s
linux-cross (armv7)	3m 49s
macos	2m 42s
linux-cross (s390x)	3m 33s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 48s
linux-cross (ppc64le)	3m 46s
musllinux (x86_64-unknown-linux-musl)	1m 22s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	2m 10s
linux-cross (ppc64)	1m 44s
windows (x64)	1m 21s
musllinux (i686-unknown-linux-musl)	1m 15s
windows (x86)	1m 32s
Release	0s
	31m 38s

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