message: simplify option clone
diff: @@ -216,7 +216,7 @@ fn convert_dependencies(pkg: &MetadataPackage) -> Vec<(String, String, String)>
  for dependency in &pkg.dependencies {
  let name = dependency.name.clone();
  let version = dependency.req.clone();
  - let kind = dependency.kind.as_ref().map(|s| s.clone()).unwrap_or_else(|| "normal".into());
  + let kind = dependency.kind.clone().unwrap_or_else(|| "normal".into());
  dependencies.push((name, version, kind.to_string()));
  }
  dependencies
  