Change compatibility of plotlywidget to JupyterLab 1.0

Author: jonmmease

packages/javascript/plotlywidget/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "plotlywidget",
-  "version": "1.0.0-alpha.3",
+  "version": "1.0.0-alpha.4",
   "description": "The plotly JupyterLab extension",
   "author": "The plotly.py team",
   "license": "MIT",
@@ -36,7 +36,7 @@
   },
   "dependencies": {
     "plotly.js": "^1.48.3",
-    "@jupyter-widgets/base": "^1.0.0",
+    "@jupyter-widgets/base": "^2.0.0",
     "lodash": "^4.17.4"
   },
   "jupyterlab": {

packages/javascript/plotlywidget/package.json

@@ -12440,7 +12440,7 @@ module.exports = function identity(d) { return d; };
 /* 18 */
 /***/ (function(module, exports) {
 
-module.exports = {"name":"plotlywidget","version":"1.0.0-alpha.3","description":"The plotly JupyterLab extension","author":"The plotly.py team","license":"MIT","main":"src/index.js","repository":{"type":"git","url":"https://github.com/plotly/plotly.py"},"keywords":["jupyter","widgets","ipython","ipywidgets","plotly"],"files":["src/**/*.js","dist/*.js","style/*.*"],"scripts":{"build":"npm run build:src","build:src":"rimraf dist && tsc","clean":"rimraf dist/ && rimraf  ../../python/plotly/plotlywidget/static'","prepublish":"webpack","test":"echo \"Error: no test specified\" && exit 1"},"devDependencies":{"webpack":"^3.10.0","rimraf":"^2.6.1","ify-loader":"^1.1.0","typescript":"~3.1.1"},"dependencies":{"plotly.js":"^1.48.3","@jupyter-widgets/base":"^1.0.0","lodash":"^4.17.4"},"jupyterlab":{"extension":"src/jupyterlab-plugin.js"}}
+module.exports = {"name":"plotlywidget","version":"1.0.0-alpha.4","description":"The plotly JupyterLab extension","author":"The plotly.py team","license":"MIT","main":"src/index.js","repository":{"type":"git","url":"https://github.com/plotly/plotly.py"},"keywords":["jupyter","widgets","ipython","ipywidgets","plotly"],"files":["src/**/*.js","dist/*.js","style/*.*"],"scripts":{"build":"npm run build:src","build:src":"rimraf dist && tsc","clean":"rimraf dist/ && rimraf  ../../python/plotly/plotlywidget/static'","prepublish":"webpack","test":"echo \"Error: no test specified\" && exit 1"},"devDependencies":{"webpack":"^3.10.0","rimraf":"^2.6.1","ify-loader":"^1.1.0","typescript":"~3.1.1"},"dependencies":{"plotly.js":"^1.48.3","@jupyter-widgets/base":"^2.0.0","lodash":"^4.17.4"},"jupyterlab":{"extension":"src/jupyterlab-plugin.js"}}
 
 /***/ }),
 /* 19 */