Remove not existence class ServiceList (#878)

Author: lopenchi

twilio/rest/preview/__init__.py

@@ -50,15 +50,6 @@ def installed_add_ons(self) -> InstalledAddOnList:
         )
         return self.marketplace.installed_add_ons
 
-    @property
-    def services(self) -> ServiceList:
-        warn(
-            "services is deprecated. Use sync.services instead.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        return self.sync.services
-
     @property
     def commands(self) -> CommandList:
         warn(