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• Matplotlib version, Python version and Platform (Windows, OSX, Linux ...)

  2.0.0b3, python-2.7.12, Linux (Fedora rawhide)

• How did you install Matplotlib and Python (pip, anaconda, from source ...)

  from source (I'm building an RPM package)

• If possible please supply a Short, Self Contained, Correct, Example
  that demonstrates the issue i.e a small piece of code which reproduces the issue
  and can be run with out any other (or as few as possible) external dependencies.

  Commit bfe5e3f erroneously bumps the cycler requirement to 0.9, when in fact the commit that introduced change_key method ended up only in master and 0.10 branches of cycler (matplotlib/cycler@1898aa2).
  Please bump the cycler requirement to 0.10.