message: fix clippy lints.
diff: @@ -310,9 +310,8 @@ impl SpotifyOAuth {
  payload.insert("grant_type", "authorization_code");
  payload.insert("scope", &self.scope);
  payload.insert("state", &self.state);
  - return self
  - .fetch_access_token(&self.client_id, &self.client_secret, &payload)
  - .await;
  + self.fetch_access_token(&self.client_id, &self.client_secret, &payload)
  + .await
  }
  /// gets the access_token for the app with given the code
  @@ -387,9 +386,8 @@ impl SpotifyOAuth {
  let mut payload = HashMap::new();
  payload.insert("refresh_token", refresh_token);
  payload.insert("grant_type", "refresh_token");
  - return self
  - .fetch_access_token(&self.client_id, &self.client_secret, &payload)
  - .await;
  + self.fetch_access_token(&self.client_id, &self.client_secret, &payload)
  + .await
  }
  /// after refresh access_token, the response may be empty
  