message: Include 'template' to possible FacebookAttachment types
  A attachment may have one of the following types: "image", "audio", "video", "file" or "template", as defined here:
diff: @@ -145,7 +145,7 @@ declare namespace botkit {
  multiple?: boolean;
  }
  interface FacebookAttachment {
  - type: 'audio' | 'file' | 'image' | 'video';
  + type: 'audio' | 'file' | 'image' | 'template' | 'video';
  payload: any;
  }
  interface FacebookBot extends Bot<FacebookSpawnConfiguration, FacebookMessage> {
  