Updated docs to include new importUrl parameter

README.md

@@ -7,12 +7,12 @@ to be done in a worker, you'll need [catiline](https://github.com/calvinmetcalf/
 usage:
 
 ```javascript
-new L.Shapefile(arrayBuffer or url[,options]);
+new L.Shapefile(arrayBuffer or url[,options][,importUrl]);
 
-L.shapefile(arrayBuffer or url[,options]);
+L.shapefile(arrayBuffer or url[,options][,importUrl]);
 ```
 
 Options are passed to L.Geojson as is. First argument is either an array buffer of a zipped shapefile,
-the url to a zipped shapefile, or the url to file.shp (this assumes file.dbf exists).
+the url to a zipped shapefile, or the url to file.shp (this assumes file.dbf exists). The importUrl parameter allows you to change where a worker loads in `shp.js` when using [catiline](https://github.com/calvinmetcalf/catiline) and defaults to `shp.js`.
 
 To easily try this out using your own shapefile, see the demo at [leaflet.calvinmetcalf.com](http://leaflet.calvinmetcalf.com/), where you can drag-and-drop your own shapefile and have it displayed on the map.