Changelog for diagrams-cairo-0.4

0.1: 17 May 2011 * initial preview release 0.1.1: 18 May 2011 * fix tic-tac-toe example 0.1.2: 18 May 2011 * link to new website 0.2: 3 June 2011 * add Typeable and other instances for Cairo type * generalize Result type to (IO (), Render ()), so programs that don't want to generate a file but just want a Render operation (e.g. to use to paint a gtk window) can use the second component. * add support for opacity attribute and path clipping 0.3: 18 June 2011 * Some new/improved examples * New features: + simple text support + simple support for external PNG images 0.4: 22 October 2011 * New features: + Support for drawing directly to Gtk widgets + Support for path fill rule attribute * New/improved examples * Improved documentation * Bug fixes: + Warning for unsupported image types (#41)