message: Add target_audience
diff: @@ -493,6 +493,12 @@ function Facebookbot(configuration) {
  get_domain_whitelist: function(cb) {
  facebook_botkit.api.messenger_profile.getAPI('whitelisted_domains', cb);
  },
  + target_audience: function(payload) {
  + var message = {
  + 'target_audience': payload
  + };
  + facebook_botkit.api.messenger_profile.postAPI(message);
  + },
  postAPI: function(message) {
  request.post('https://graph.facebook.com/v2.6/me/messenger_profile?access_token=' + configuration.access_token,
  {form: message},
  