python/cairocffi: Note optional dep.

Signed-off-by: David Spencer <baildon.research@googlemail.com>
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David Spencer 2016-05-31 22:24:40 +01:00 committed by Willy Sudiarto Raharjo
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@ -3,3 +3,5 @@ a set of Python bindings and object-oriented API for cairo_.
Cairo is a 2D vector graphics library with support for multiple backends
including image buffers, PNG, PostScript, PDF, and SVG file output.
API compatible with Pycairo.
python-xcffib is an optional dependency.