changelogs Increase changelog coverage for widely used packages

Top 300 packages on pyup.io without a changelog:

[x] flake8
[x] pyyaml
[x] six
[ ] pytz (has no up-to-date changelog https://bugs.launchpad.net/pytz/+bug/1677527, unable to translate changelog releases to actual PyPi releases)
[ ] mock (is now part of Python, changelog seems to be .gitignored: https://github.com/testing-cabal/mock/blob/master/.gitignore#L17)
[x] factory-boy
[x] jinja2
[x] docutils
[x] sphinx-rtd-theme
[x] whitenoise
[x] numpy
[x] beautifulsoup4
[x] mccabe
[x] django-braces
[x] alabaster
[ ] dj-database-url (has no changelog)
[x] cffi
[x] django-coverage-plugin
[x] newrelic
[x] pandas
[x] twine
[x] pep8-naming
[ ] snowballstemmer (seems to have no changelog)
[ ] certifi (seems there's no changelog available, #https://github.com/certifi/python-certifi/issues/57)
[x] django-storages-redux
[ ] enum34 (has no changelog)
[x] pbr
[ ] docopt (unparseable, project seems to be dead: https://github.com/docopt/docopt)
[ ] wsgiref (no changelog)
[ ] imagesize
[ ] fabric
[ ] ipython-genutils
[ ] simplegeneric
[ ] traitlets
[ ] python-memcached
[ ] pickleshare
[ ] ptyprocess
[ ] django-redis-cache
[ ] bcrypt
[ ] ipaddress
[ ] pyasn1-modules
[ ] requests-mock
[ ] flask-debugtoolbar
[ ] twisted
[ ] pymongo
[ ] configparser
[ ] termcolor
[ ] ujson
[ ] cssmin
[ ] appnope
[ ] webencodings
[ ] unicode-slugify
[ ] reportlab
[ ] tqdm
[ ] unittest2
[ ] python-magic
[ ] olefile
[ ] flake8-blind-except
[ ] flake8-quotes
[ ] pathtools
[ ] fake-factory
[ ] jupyter
[ ] pytest-asyncio
[ ] python-coveralls
[ ] pytest-timeout
[ ] sphinxcontrib-spelling
[ ] unicodecsv
[ ] drf-extensions
[ ] cnx-archive
[ ] pytest-travis-fold
[ ] django-picklefield

May 16 '17 15:05 jayfk

Jinja2 says no changelog. See http://jinja.pocoo.org/docs/2.10/changelog/

Jul 13 '18 11:07 palfrey

pbr changelog seems to be missing as well See #108

Jul 23 '18 14:07 Harmon758

pandas changelog seems to be missing as well now See #180

Feb 06 '19 04:02 Harmon758