Bump version to 0.3.0 #434

Job	Run time
macos-x86_64	6m 53s
macos-aarch64	6m 53s
linux (x86_64-unknown-linux-gnu)	6m 53s
sdist	7m 3s
windows (x86_64-pc-windows-msvc, x64)	6m 49s
linux (i686-unknown-linux-gnu)	6m 52s
windows (i686-pc-windows-msvc, x86)	6m 49s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	6m 50s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le)	6m 51s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	6m 49s
linux-s390x (s390x-unknown-linux-gnu, s390x)	6m 52s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64)	6m 50s
linux-arm (arm-unknown-linux-musleabihf, arm)	6m 51s
musllinux (x86_64-unknown-linux-musl)	6m 51s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	6m 47s
musllinux (i686-unknown-linux-musl)	6m 49s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	6m 49s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, nightly)	6m 48s
	2h 3m 19s

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