Update to to plotly.js 1.50.1 (#1820)

* Update to to plotly.js 1.50.1

Author: jonmmease

packages/javascript/jupyterlab-plotly/package-lock.json

@@ -31,7 +31,7 @@
     "typescript": "~3.1.1"
   },
   "dependencies": {
-    "plotly.js": "^1.49.4",
+    "plotly.js": "^1.50.1",
     "@types/plotly.js": "^1.44.9",
     "@jupyterlab/rendermime-interfaces": "^1.3.0",
     "@phosphor/messaging": "^1.2.3",

packages/javascript/jupyterlab-plotly/package.json

@@ -35,7 +35,7 @@
     "typescript": "~3.1.1"
   },
   "dependencies": {
-    "plotly.js": "^1.49.4",
+    "plotly.js": "^1.50.1",
     "@jupyter-widgets/base": "^2.0.0",
     "lodash": "^4.17.4"
   },