message: types(gateway): make since nullable
diff: @@ -166,7 +166,7 @@ export interface DiscordUpdateVoiceState {
  /** https://discord.com/developers/docs/topics/gateway#update-status */
  export interface DiscordUpdateStatus {
  /** Unix time (in milliseconds) of when the client went idle, or null if the client is not idle */
  - since?: number;
  + since: number | null;
  /** null, or the user's activities */
  activities: DiscordActivity[] | null;
  /** The user's new status */
  