Convert the result to vector graphics

Hi,

depending on the input, the output may be shrunk even more when converted to vector graphics, as you also noticed in https://mzucker.github.io/2018/05/14/maptrace.html :)

Here is a quick and dirty example:
./noteshrink.py -e ".pnm" -P "convert %i %o" -c "potrace -b pdf -o %o %i" examples/tree.jpg

Maybe the example can be added to the README?

Unfortunately potrace only supports binary images.

Ciao,
Antonio

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