message: Remove unnecessary `mut self` in `Command::map`
diff: @@ -33,7 +33,7 @@ impl<T> Command<T> {
  /// Applies a transformation to the result of a [`Command`].
  #[cfg(target_arch = "wasm32")]
  - pub fn map<A>(mut self, f: impl Fn(T) -> A + 'static + Clone) -> Command<A>
  + pub fn map<A>(self, f: impl Fn(T) -> A + 'static + Clone) -> Command<A>
  where
  T: 'static,
  {
  