message: Remove no-longer-needed `Config::get_bool`
diff: @@ -445,10 +445,6 @@ impl Config {
  }
  }
  - pub fn get_bool(&self, key: &str) -> CargoResult<OptValue<bool>> {
  - self.get::<Option<Value<bool>>>(key)
  - }
  -
  fn get_bool_priv(&self, key: &ConfigKey) -> Result<OptValue<bool>, ConfigError> {
  match self.get_env(key)? {
  Some(v) => Ok(Some(v)),
  