- Update to 1.4.0:
* Read XDG_PICTURES_DIR from user-dirs.dirs file
* add bash completion
* render: use pixman to compose output buffers
* render: use convolution filter when downscaling
* Allow setting compression level for PNG output
* write_png: fix out of bounds read
* render: add support for ≤ 24bpp pixel formats
* Use alternate Wayland to Pixman format conversion on big-endian
* Rename cairo_{jpg,ppm} to write_{jpg,ppm}
* Use stream-type functions to save images
* Remove cairo dependency
* man: fix wrong section headers
* Add example for taking screenshot of active window
* Make get_output_dir return value const
* Replace sprintf with snprintf
* Make output_filename const
* Stop using PATH_MAX