message: Remove dead `Config::get_i64` method
diff: @@ -548,12 +548,6 @@ impl Config {
  }
  }
  - // Recommended to use `get` if you want a specific type, such as an unsigned value.
  - // Example: `config.get::<Option<u32>>("some.key")?`.
  - pub fn get_i64(&self, key: &str) -> CargoResult<OptValue<i64>> {
  - self.get::<Option<Value<i64>>>(key)
  - }
  -
  fn get_integer(&self, key: &ConfigKey) -> Result<OptValue<i64>, ConfigError> {
  match self.get_env::<i64>(key)? {
  Some(v) => Ok(Some(v)),
  