Version 0.6
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    - Added "ax" keyword to the plotting routines to specify the axes object on which the diagram will be created.
      Thanks goes to https://github.com/sinhrks

Version 0.5
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    - Fixed a bug (issue 1, "unreferenced variable 's'" in venn2 and venn2_circles)

Version 0.4
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    - Fixed a bug ("ValueError: to_rgba: Invalid rgba arg" when specifying lighter set colors)

Version 0.3
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    - Changed package name from `matplotlib.venn` to `matplotlib_venn`.
    - Fixed up some places to comply with pep8 lint checks.

Version 0.2
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    - Changed parameterization of venn3 and venn3_circles (now expects 7-element vectors as arguments rather than 8-element).
    - 2-set venn diagrams (functions venn2 and venn2_circles)
    - Added support for non-intersecting sets ("Euler diagrams")
    - Minor fixes here and there.

Version 0.1
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    - Initial version, three-circle area-weighted venn diagrams.