message: Customize FacebookAPI link
diff: @@ -494,7 +494,7 @@ function Facebookbot(configuration) {
  facebook_botkit.api.messenger_profile.getAPI('whitelisted_domains', cb);
  },
  postAPI: function(message) {
  - request.post('https://graph.facebook.com/v2.6/me/messenger_profile?access_token=' + configuration.access_token,
  + request.post('https://' + api_host + '/v2.6/me/messenger_profile?access_token=' + configuration.access_token,
  {form: message},
  function(err, res, body) {
  if (err) {
  @@ -522,7 +522,7 @@ function Facebookbot(configuration) {
  var message = {
  'fields': [type]
  };
  - request.delete('https://graph.facebook.com/v2.6/me/messenger_profile?access_token=' + configuration.access_token,
  + request.delete('https://' + api_host + '/v2.6/me/messenger_profile?access_token=' + configuration.access_token,
  {form: message},
  function(err, res, body) {
  if (err) {
  @@ -533,7 +533,7 @@ function Facebookbot(configuration) {
  });
  },
  getAPI: function(fields, cb) {
  - request.get('https://graph.facebook.com/v2.6/me/messenger_profile?fields=' + fields + '&access_token=' + configuration.access_token,
  + request.get('https://' + api_host + '/v2.6/me/messenger_profile?fields=' + fields + '&access_token=' + configuration.access_token,
  function(err, res, body) {
  if (err) {
  facebook_botkit.log('Could not get messenger profile');
  @@ -549,7 +549,7 @@ function Facebookbot(configuration) {
  'type': 'standard',
  'image_size': image_size || 1000
  };
  - request.post('https://graph.facebook.com/v2.6/me/messenger_codes?access_token=' + configuration.access_token,
  + request.post('https://' + api_host + '/v2.6/me/messenger_codes?access_token=' + configuration.access_token,
  {form: message},
  function(err, res, body) {
  if (err) {
  