message: Replace deprecated `trim_left_matches`
diff: @@ -38,7 +38,7 @@ impl<T: DeserializeOwned + Send + 'static> List<T> {
  pub fn get_next(client: &Client, url: &str, last_id: &str) -> Response<List<T>> {
  if url.starts_with("/v1/") {
  // TODO: Maybe parse the URL? Perhaps `List` should always parse its `url` field.
  - let mut url = url.trim_left_matches("/v1/").to_string();
  + let mut url = url.trim_start_matches("/v1/").to_string();
  if url.contains('?') {
  url.push_str(&format!("&starting_after={}", last_id));
  } else {
  