message: fix user_playlist_remove_all_occurrences_tracks() 400 error
diff: @@ -37,6 +37,7 @@ impl Spotify {
  }
  }
  + // pub fn prefix(mut self, prefix: &str) -> Spotify {
  pub fn prefix(mut self, prefix: &str) -> Spotify {
  self.prefix = prefix.to_owned();
  self
  @@ -590,6 +591,7 @@ impl Spotify {
  let result = self.put(&mut url, Value::Object(params));
  self.convert_result::<CUDResult>(&result.unwrap_or_default())
  }
  +
  ///https://developer.spotify.com/web-api/remove-tracks-playlist/
  ///Removes all occurrences of the given tracks from the given playlist
  ///Parameters:
  @@ -609,7 +611,13 @@ impl Spotify {
  .map(|id| self.get_uri(Type::Track, id))
  .collect();
  let mut params = Map::new();
  - params.insert("tracks".to_owned(), uris.into());
  + let mut tracks: Vec<Map<String, Value>> = vec![];
  + for uri in uris {
  + let mut map = Map::new();
  + map.insert("uri".to_owned(), uri.into());
  + tracks.push(map);
  + }
  + params.insert("tracks".to_owned(), tracks.into());
  if let Some(_snapshot_id) = snapshot_id {
  params.insert("snapshot_id".to_owned(), _snapshot_id.into());
  }
  