`w`: implement --short option (#61) #61

Job	Run time
cargo fmt --all -- --check	15s
cargo check (ubuntu-latest)	19s
cargo clippy -- -D warnings (ubuntu-latest)	23s
Code Coverage (ubuntu-latest, unix)	1m 59s
cargo check (macOS-latest)	26s
cargo clippy -- -D warnings (macOS-latest)	26s
cargo test (ubuntu-latest)	29s
Code Coverage (macos-latest, macos)	1m 39s
cargo check (windows-latest)	1m 18s
cargo clippy -- -D warnings (windows-latest)	1m 43s
cargo test (macOS-latest)	31s
Code Coverage (windows-latest, windows)	5m 4s
cargo test (windows-latest)	2m 11s
	16m 43s

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