Merge pull request #343 from linebender/simplify_lines #476

Job	Run time
cargo fmt	9s
cargo test msrv	54s
Docs (macOS-latest)	44s
cargo test nightly (macOS-latest)	40s
Docs (windows-2019)	1m 15s
cargo test nightly (windows-2019)	47s
cargo clippy+test (wasm32) (macOS-latest)	49s
cargo clippy+test (macOS-latest)	1m 3s
Docs (ubuntu-latest)	33s
cargo test nightly (ubuntu-latest)	26s
cargo clippy+test (wasm32) (windows-2019)	1m 25s
cargo clippy+test (windows-2019)	1m 22s
cargo clippy+test (wasm32) (ubuntu-latest)	38s
cargo clippy+test (ubuntu-latest)	46s
	11m 31s

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