Prepare for 0.9.0 release #301

Job	Run time
windows-test (nightly, i686-pc-windows-gnu)	1m 54s
cross-ios-build (stable, aarch64-apple-ios)	18s
windows-test (nightly, x86_64-pc-windows-gnullvm)	1m 47s
native-test (nightly, windows-latest)	1m 10s
cross-ios-build (nightly, x86_64-apple-ios)	18s
windows-test (stable, i686-pc-windows-gnu)	1m 51s
windows-test (stable, x86_64-pc-windows-gnullvm)	2m 1s
cross-ios-build (nightly, aarch64-apple-ios)	1m 38s
bare-cross-build (nightly, x86_64-unknown-haiku)	30s
native-test (stable, ubuntu-latest)	21s
native-test (1.88.0, macOS-latest)	31s
native-test (1.88.0, windows-latest)	1m 3s
native-test (stable, windows-latest)	1m 6s
native-test (1.88.0, ubuntu-latest)	18s
cross-ios-build (stable, x86_64-apple-ios)	19s
bare-cross-build (nightly, x86_64-unknown-openbsd)	30s
msys2-test	2m 56s
native-test (nightly, macOS-latest)	45s
bare-cross-build (nightly, x86_64-unknown-fuchsia)	32s
native-test (stable, macOS-latest)	30s
no-std-build-test	30s
bare-cross-build (nightly, x86_64-unknown-redox)	31s
native-test (nightly, ubuntu-latest)	18s
bare-cross-build (nightly, wasm32-unknown-unknown)	31s
	22m 8s

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