[cairo] since which version? cairo.Format

[buhtz at posteo.de]

Dear Christoph, 

thanks for your answer.

> It was added with 1.13, see
> https://pycairo.readthedocs.io/en/latest/reference/enums.html#cairo.Format

Is this "cairo.version" (pycairo) or "cairo.cairo_version()" (C cairo
library)?