Add `--ignore-unknown-features` to the CI. #167

Job	Run time
cargo test (windows-latest)	44s
cargo test (macos-latest)	24s
cargo test (ubuntu-latest)	13s
cargo check (msrv) (wasm32)	20s
cargo check (msrv) (windows-latest)	33s
cargo clippy (windows-latest)	42s
cargo check (msrv) (macos-latest)	21s
cargo clippy (macos-latest)	27s
cargo clippy (wasm32)	26s
cargo check (msrv) (ubuntu-latest)	16s
cargo fmt	24s
cargo clippy (ubuntu-latest)	27s
cargo test (wasm32)	25s
typos	8s
cargo doc	24s
	6m 14s

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