filename extension is lost on unzip

[vim-zz]

I don't know if its a gzip issue or flate2 issue, but in the gzbuilder example, when I open unarchive tools on my Mac, I get the original filename without the original extension.

To reproduce just run the example:

cargo run --example gzbuilder

On on Mac, open the Finder and click on the result gz file under examples. I would expect to see a new file named hello_world.txt but I see hello_world

keep up the good work!

[alexcrichton]

Thanks for the report! This is probably just a filename naming convention where the file is named hello_world.gz instead of hello_world.txt.gz, and the default tools may just chop off the .gz trailing name to produce the new filename. Should be an easy update to the example though!