Format map.fire call to match breaking change depending on version

ref #766

blah

Pass a version option

Author: tristen

README.md

@@ -84,7 +84,7 @@ Install dependencies, build the source files and crank up a server via:
 ```
 git clone [email protected]:mapbox/mapbox-gl-draw.git
 npm install
-npm start & open http://localhost:9966/debug/?access_token=<token>
+npm start & open http://localhost:9967/debug/?access_token=<token>
 ```
 
 ### Testing

debug/index.html

@@ -80,7 +80,10 @@
 
   map.addControl(new mapboxgl.NavigationControl(), 'top-left');
 
-  var Draw = window.Draw = new MapboxDraw();
+  var Draw = window.Draw = new MapboxDraw({
+    mapboxglVersion: mapboxgl.version
+  });
+
   var drawIsActive = true;
   map.addControl(Draw, 'bottom-right');