Prepare 3.0 (#321) #580

Job	Run time
format	6s
Clippy	46s
cargo-test (ubuntu-22.04, default, stable)	4m 24s
cargo-build (aarch64-linux-android, ubuntu-22.04)	3m 10s
cargo-test (macos-12, default, stable)	12m 51s
cargo-test (windows-2019, default, stable)	9m 29s
cargo-build (armv7-linux-androideabi, ubuntu-22.04)	3m 3s
cargo-build (i686-linux-android, ubuntu-22.04)	3m 7s
cargo-build (x86_64-linux-android, ubuntu-22.04)	3m 12s
cargo-test (ubuntu-22.04, beta)	4m 50s
cargo-build (x86_64-unknown-linux-musl, ubuntu-22.04)	2m 37s
cargo-test (ubuntu-22.04, blocking)	5m 1s
cargo-build (aarch64-apple-ios, macos-12)	3m 38s
cargo-test (ubuntu-22.04, blocking,beta)	5m 24s
cargo-test (ubuntu-22.04, tls-rustls --no-default-features)	4m 32s
cargo-test (ubuntu-22.04, tls-vendored-openssl --no-default-features)	5m 26s
cargo-test (ubuntu-22.04, beta, default)	4m 1s
cargo-test (ubuntu-22.04, 1.75.0, default)	4m 41s
	1h 20m 18s

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