Display modification times of input files in context and unified diff #152

Job	Run time
cargo check (ubuntu-latest)	15s
cargo check (macOS-latest)	45s
cargo check (windows-latest)	35s
cargo clippy -- -D warnings (ubuntu-latest)	14s
cargo fmt --all -- --check	13s
cargo clippy -- -D warnings (macOS-latest)	26s
cargo test (ubuntu-latest)	45s
cargo clippy -- -D warnings (windows-latest)	46s
cargo test (macOS-latest)	6m 10s
Code Coverage (ubuntu-latest, unix)	2m 10s
cargo test (windows-latest)	51s
Code Coverage (macos-latest, macos)	6m 59s
GNU test suite	32s
Code Coverage (windows-latest, windows)	55s
	21m 36s

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