Update Rust crate unicode-width to v0.1.14 #279

Job	Run time
cargo check (ubuntu-latest)	7s
cargo clippy -- -D warnings (ubuntu-latest)	25s
cargo fmt --all -- --check	8s
cargo check (macOS-latest)	11s
cargo clippy -- -D warnings (macOS-latest)	13s
cargo check (windows-latest)	33s
cargo clippy -- -D warnings (windows-latest)	1m 36s
GNU test suite	1m 31s
cargo test (ubuntu-latest)	32s
cargo test (macOS-latest)	3m 16s
Code Coverage (ubuntu-latest, unix)	2m 1s
cargo test (windows-latest)	3m 45s
Code Coverage (macos-latest, macos)	2m 34s
Code Coverage (windows-latest, windows)	6m 7s
	22m 59s

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