Remove obsolete lodash dependency

Author: jasongrout

{{cookiecutter.github_project_name}}/js/package.json

@@ -36,8 +36,7 @@
     "rimraf": "^2.6.1"
   },
   "dependencies": {
-    "@jupyter-widgets/base": "^1.1 || ^2 || ^3 || ^4 || ^6",
-    "lodash": "^4.17.4"
+    "@jupyter-widgets/base": "^1.1 || ^2 || ^3 || ^4 || ^6"
   },
   "jupyterlab": {
     "extension": "lib/labplugin",