JupyterLab 1.0 support

Author: martinRenou

{{cookiecutter.github_project_name}}/package.json

@@ -48,7 +48,7 @@
     "watch:nbextension": "webpack --watch"
   },
   "dependencies": {
-    "@jupyter-widgets/base": "^1.1.10"
+    "@jupyter-widgets/base": "^1.1.10 || ^2"
   },
   "devDependencies": {
     "@phosphor/application": "^1.6.0",