greg.models: include verified_when in PersonIdentity.__repr__

Fixes: GREG-20

greg/models.py

@@ -165,15 +165,14 @@ class PersonIdentity(BaseModel):
     verified_when = models.DateField(null=True)
 
     def __repr__(self):
-        return (
-            "{}(id={!r}, type={!r}, source={!r}, value={!r}, verified_by={!r})".format(
-                self.__class__.__name__,
-                self.pk,
-                self.type,
-                self.source,
-                self.value,
-                self.verified_by,
-            )
+        return "{}(id={!r}, type={!r}, source={!r}, value={!r}, verified_by={!r}, verified_when={!r})".format(
+            self.__class__.__name__,
+            self.pk,
+            self.type,
+            self.source,
+            self.value,
+            self.verified_by,
+            self.verified_when,
         )