added missing events to base class

lib/ansible/plugins/callback/__init__.py

@@ -304,3 +304,12 @@ class CallbackBase:
 
     def v2_playbook_on_include(self, included_file):
         pass #no v1 correspondance
+
+    def v2_playbook_item_on_ok(self, result):
+        pass
+
+    def v2_playbook_item_on_failed(self, result):
+        pass
+
+    def v2_playbook_item_on_skipped(self, result)
+        pass