Description: Add module name to package.json
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "name": "dagre",
   "version": "0.8.5",
+  "module": "index.js",
   "description": "Graph layout for JavaScript",
   "author": "Chris Pettitt <cpettitt@gmail.com>",
   "contributors": [