text-diff your 02packages.txt.gz via gut automagically

.gitattributes

# make git recognize *.txt.gz files as compressed text, such that git knows to
# use the "gz" diff driver on them
*.txt.gz diff=gz

.gitconfig

[diff "gz"]
    # behold, the power of zcat!
    textconv = zcat
    # and the lovely laziness!
    cachetextconv = true
    binary = true