Fix attribution text width (and font size) calculation [Cairo] #29
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text_extents(attribution)[3]refers to line height, not line width, e.g.cairo.TextExtents(x_bearing=0.0, y_bearing=-18.0, width=252.0, height=27.0, x_advance=252.0, y_advance=0.0)changed
[3]to.width, though[2]would do the same