Copyright for celery source package in Bionic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: celery
Upstream-Contact: Ask Solem 
Source: http://pypi.python.org/pypi/celery/

Files: *
Copyright: 2009-2014, Ask Solem and contributors.
License: BSD-2-clause

Files: docs/*
Copyright: 2009-2014, Ask Solem and contributors.
License: CC-BY-SA-4

Files: celery/utils/functional.py
Copyright: 2001-2007, Python Software
License: PSF-2

Files: debian/*
Copyright: 2014, Brian May 
           2012-2015, Michael Fladischer 
           2010, Elliot Murphy
License: BSD-2-clause

License: BSD-2-clause
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