Bump version to v0.5.4 #66

Job	Run time
linux (x86_64-unknown-linux-gnu)	4m 28s
linux (i686-unknown-linux-gnu)	6m 46s
macos-x86_64	6m 34s
sdist	4m 0s
macos-aarch64	3m 32s
musllinux (x86_64-unknown-linux-musl)	4m 40s
musllinux (i686-unknown-linux-musl)	3m 58s
linux-cross (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	5m 49s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	5m 18s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	4m 59s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	4m 49s
linux-cross (s390x-unknown-linux-gnu, s390x)	5m 19s
windows (x86_64-pc-windows-msvc, x64)	8m 16s
linux-cross (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	5m 29s
windows (i686-pc-windows-msvc, x86)	7m 52s
linux-cross (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	5m 7s
windows (aarch64-pc-windows-msvc, x64)	9m 22s
linux-cross (arm-unknown-linux-musleabihf, arm)	4m 39s
	1h 40m 57s

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