Release v0.8.4 #119

Job	Run time
build-unix (stable, ubuntu)	13s
build-windows (i686, msvc, stable)	1m 44s
build-unix (stable, macos)	23s
build-windows (i686, msvc, beta)	58s
build-unix (beta, ubuntu)	18s
build-unix (beta, macos)	21s
build-unix (nightly, ubuntu)	18s
build-unix (nightly, macos)	23s
build-windows (i686, msvc, nightly)	1m 18s
build-windows (x86_64, gnu, stable)	4m 53s
build-windows (x86_64, gnu, beta)	3m 15s
build-windows (x86_64, gnu, nightly)	3m 10s
build-windows (x86_64, msvc, stable)	1m 33s
build-windows (x86_64, msvc, beta)	53s
build-windows (x86_64, msvc, nightly)	48s
build-windows (aarch64, msvc, stable)	1m 21s
build-windows (aarch64, msvc, beta)	46s
build-windows (aarch64, msvc, nightly)	38s
	23m 13s

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