[jira] [Created] (AIRFLOW-4219) Update documentation

[Bas Harenslak (JIRA)]

Bas Harenslak created AIRFLOW-4219:
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             Summary: Update documentation
                 Key: AIRFLOW-4219
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-4219
             Project: Apache Airflow
          Issue Type: Sub-task
            Reporter: Bas Harenslak


There are a few references to Python 2.* in the docs (see e.g. 
CONTRIBUTING.md). These should be removed.



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