chore: Update Facebook Messenger gem (#2342)

app/bot/facebook_bot.rb

@@ -1,15 +1,13 @@
 require 'facebook/messenger'
 
 class FacebookBot
-  include Facebook::Messenger
-
-  Bot.on :message do |message|
+  Facebook::Messenger::Bot.on :message do |message|
     Rails.logger.info "MESSAGE_RECIEVED #{message}"
     response = ::Integrations::Facebook::MessageParser.new(message)
     ::Integrations::Facebook::MessageCreator.new(response).perform
   end
 
-  Bot.on :delivery do |delivery|
+  Facebook::Messenger::Bot.on :delivery do |delivery|
     # delivery.ids       # => 'mid.1457764197618:41d102a3e1ae206a38'
     # delivery.sender    # => { 'id' => '1008372609250235' }
     # delivery.recipient # => { 'id' => '2015573629214912' }
@@ -20,7 +18,7 @@ class FacebookBot
     Rails.logger.info "Human was online at #{delivery.at}"
   end
 
-  Bot.on :message_echo do |message|
+  Facebook::Messenger::Bot.on :message_echo do |message|
     Rails.logger.info "MESSAGE_ECHO #{message}"
     response = ::Integrations::Facebook::MessageParser.new(message)
     ::Integrations::Facebook::MessageCreator.new(response).perform