cpal

Prepare 0.15.3 release #836

Job	Run time
ubuntu-test	1m 49s
android-check	35s
asmjs-wasm32-test (wasm32-unknown-emscripten)	52s
cargo-publish	0s
clippy-test	1m 3s
linux-check-and-test-armv7	1m 56s
macos-test	2m 3s
rustfmt-check	11s
wasm32-bindgen-test (wasm32-unknown-unknown)	31s
wasm32-wasi-test (wasm32-wasi)	25s
windows-test (x86_64)	3m 11s
windows-test (i686)	3m 5s
android-apk-build	2m 24s
ios-build	4m 7s
wasm-beep-build	26s
	22m 38s

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