This release will reject invalid color_type or
bit_depth found on the commandline. Some #defines
were moved from pngcrush.h to pngcrush.c so they
will work with the "nolib" distributions.
This version is built with libpng-1.2.29 to avoid
all known security vulnerabilities, and is also
built with zlib-1.2.3.2. Pngcrush now refrains
from adding a gAMA chunk when the input file only
contains the sRGB chunk, unless the user
explicitly requests it.