Fix issue #45: Change docstring in test, make params field as an optional

Author: Ihor Bilous

mailtrap/models/contacts.py

@@ -157,4 +157,4 @@ class ContactEvent:
     contact_id: str
     contact_email: str
     name: str
-    params: dict[str, Any]
+    params: Optional[dict[str, Any]] = None

tests/unit/models/test_contacts.py

@@ -227,7 +227,7 @@ def test_contact_event_params_api_data_should_return_correct_dict(
         }
 
     def test_contact_event_params_with_empty_params_should_work(self) -> None:
-        """Test that empty filters list works correctly."""
+        """Test that ContactEventParams works correctly when params are omitted."""
         params = ContactEventParams(name="UserLogin")
         api_data = params.api_data
         assert api_data == {"name": "UserLogin"}