style: remove unnecessary braces in `RevisionRef::from_str` (#48) #156

Job	Run time
cargo-fmt	8s
cargo-test (ubuntu-latest, stable)	29s
cargo-test (windows-latest, stable)	1m 33s
cargo-clippy	25s
cargo-test (macos-latest, stable)	24s
cargo-deny	36s
	3m 35s

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