Test

Add Process::combined_with utility method #444

Job	Run time
miri	53s
rustdoc	26s
clippy	40s
clap-validator	50s
test (ubuntu-latest, stable)	54s
test (ubuntu-latest, beta)	1m 3s
cargo-deny (advisories)	24s
test (ubuntu-latest, nightly)	53s
cargo-deny (bans licenses sources)	27s
test (macos-latest, stable)	1m 7s
test (macos-latest, beta)	1m 21s
test (macos-latest, nightly)	1m 19s
test (windows-latest, stable)	1m 56s
test (windows-latest, beta)	1m 47s
test (windows-latest, nightly)	1m 36s
	15m 36s

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