Don't skip first dash in dash pattern #516

Job	Run time
cargo fmt	4s
cargo clippy+test (macOS-latest)	32s
cargo clippy+test (windows-2019)	1m 20s
cargo test msrv	1m 19s
cargo test nightly (macOS-latest)	24s
cargo clippy+test (ubuntu-latest)	37s
cargo clippy+test (wasm32) (macOS-latest)	1m 11s
cargo test nightly (windows-2019)	46s
cargo clippy+test (wasm32) (windows-2019)	1m 13s
cargo test nightly (ubuntu-latest)	24s
cargo clippy+test (wasm32) (ubuntu-latest)	29s
Docs (macOS-latest)	31s
Docs (windows-2019)	1m 11s
Docs (ubuntu-latest)	14s
	10m 15s

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