chore: removed preview sync api

Author: sbansla

lib/twilio-ruby/rest/preview.rb

@@ -52,15 +52,6 @@ def installed_add_ons(sid=:unset)
         self.marketplace.installed_add_ons(sid)
       end
 
-      ##
-      # @param [String] sid The sid
-      # @return [Twilio::REST::Preview::Sync::ServiceInstance] if sid was passed.
-      # @return [Twilio::REST::Preview::Sync::ServiceList]
-      def services(sid=:unset)
-        warn "services is deprecated. Use sync.services instead."
-        self.sync.services(sid)
-      end
-
       ##
       # @param [String] sid The sid
       # @return [Twilio::REST::Preview::Wireless::CommandInstance] if sid was passed.