Ed diff: compact ranges of lines where possible (fixes #21) #65

Job	Run time
cargo check (ubuntu-latest)	16s
cargo test (ubuntu-latest)	38s
cargo check (macOS-latest)	15s
Code Coverage (ubuntu-latest, unix)	1m 9s
cargo clippy -- -D warnings (ubuntu-latest)	6s
cargo check (windows-latest)	43s
Code Coverage (macos-latest, macos)	1m 6s
cargo clippy -- -D warnings (macOS-latest)	8s
Code Coverage (windows-latest, windows)	49s
cargo clippy -- -D warnings (windows-latest)	1m 15s
cargo test (macOS-latest)	1m 49s
cargo fmt --all -- --check	6s
cargo test (windows-latest)	1m 31s
GNU test suite	31s
	10m 22s

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