Fixing display publisher (Python 3)

IPython/core/displaypub.py

@@ -114,11 +114,11 b' class CapturingDisplayPublisher(DisplayPublisher):'
     """A DisplayPublisher that stores"""
     outputs = List()
 
-    def publish(self, data, metadata=None, source=None):
+    def publish(self, data, metadata=None, source=None, *, transient=None, update=False):
         self.outputs.append((data, metadata))
-    
+
     def clear_output(self, wait=False):
         super(CapturingDisplayPublisher, self).clear_output(wait)
-        
+
         # empty the list, *do not* reassign a new list
         del self.outputs[:]