Log Message:
py-wand: updated to 0.5.9

Version 0.5.9
Fixed dither parameter in Image.quantize() method for ImageMagick-7.
Added Image.combine() method. [Thanks Fred!]
Check __fspath__ attribute for filename parameter when calling Image.save().
Fixed typo in ProfileDict documentation.
Fixed typo in Resource.c_is_resource documentation.
Updated broken sentence in Image.thumbnail() method.
Check for linux_distribution() as method was removed in Python 3.8.
Added Image.delay property. Previously only available with SingleImage class.