add esdoc as dependency

package.json

@@ -13,6 +13,7 @@
   "devDependencies": {
     "browser-es-module-loader": "^0.1.6",
     "doxdox": "^0.1.15",
+    "esdoc": "^0.4.8",
     "onchange": "~3.0.2",
     "rollup": "~0.35.10"
   }