[AIRFLOW-997] Update setup.cfg to point to Apache

The setup.cfg should point to the Apache PMC as "author" and the
dev mailing list as contact email.

setup.cfg

@@ -15,8 +15,8 @@
 name = Airflow
 summary = Airflow is a system to programmatically author, schedule and monitor data pipelines.
 description-file = README.md
-author = Maxime Beauchemin
-author-email = maximebeauchemin@gmail.com
+author = Apache Airflow PMC
+author-email = dev@airflow.incubator.apache.org
 license = Apache License, Version 2.0
 
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