Update the "Usage" example in the README

[joshday]

Right after I merged my other PR I realized the README example was using the "test.dbf" file that I had deleted.

[visr]

I see you're using the path return value from write you added in #35. Is that something you've seen elsewhere? I think I used number of bytes first because that's what Base does. We could consider specifying it in JuliaGeo/GeoInterface.jl#134 as well.

[joshday]

Hmm, I was thinking Base.write(path, x) did return the path, but it's JSON3.write and CSV.write that I borrowed it from.

I'm happy to change it back/follow whatever the consensus is. I strongly agree about keeping the interface consistent between packages.

I changed the example to work with either behavior.

[visr]

Right, good to know. Returning the path seems more useful than the number of bytes for this use case.

[asinghvi17]

From https://juliageo.org/GeometryOps.jl/dev/tutorials/creating_geometry#save-geometry it seems only Shapefile.jl returns the number of bytes, everything else returns the path.