Fix pylint too-few-public-methods warning in TestJsonWebDataSource

Author: ssenart

tests/test_jsonparser.py

@@ -67,7 +67,7 @@ def test_readings_without_any_date_are_ignored(self):
         assert readings == []
 
 
-class TestJsonWebDataSource:
+class TestJsonWebDataSource:  # pylint: disable=too-few-public-methods
 
     # ------------------------------------------------------
     def test_requested_consumption_type_is_forwarded_to_api(self):