moved opts to constructor for new browserify version

The new browserify version (at least browserify-5.12.1) changed the behavior a bit. I got the following error when I tried to build with original sources.
"Error: bundle() no longer accepts option arguments.
Move all option arguments to the browserify() constructor.
    at Browserify.bundle (~/PathFinding.js/node_modules/browserify/index.js:604:15)
    at ..."
So I fixed the line to get it working with the lastest version.