[jira] [Created] (AIRFLOW-4207) Replace __metaclass__ attribute by metaclass as a class keyword argument

[Fokko Driesprong (JIRA)]

Fokko Driesprong created AIRFLOW-4207:
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             Summary: Replace __metaclass__ attribute by metaclass as a class 
keyword argument
                 Key: AIRFLOW-4207
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-4207
             Project: Apache Airflow
          Issue Type: Sub-task
            Reporter: Fokko Driesprong
             Fix For: 2.0.0






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