message: Resolve a nonminimal_bool lint warning
diff: @@ -224,7 +224,7 @@ pub trait ArgMatchesExt {
  if !path.ends_with("Cargo.toml") {
  bail!("the manifest-path must be a path to a Cargo.toml file")
  }
  - if !fs::metadata(&path).is_ok() {
  + if fs::metadata(&path).is_err() {
  bail!(
  "manifest path `{}` does not exist",
  self._value_of("manifest-path").unwrap()
  