Update to be compatible with JupyterLab 2.0.

package.json

 {
   "name": "finesse-syntax-jupyterlab",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "description": "Syntax highlighting for kat script within JupyterLab.",
   "keywords": [
     "jupyter",
@@ -30,15 +30,15 @@
     "watch": "tsc -w"
   },
   "dependencies": {
-    "@jupyterlab/application": "^1.2.1",
-    "@jupyterlab/notebook": "^1.2.2",
-    "@jupyterlab/cells": "^1.2.2",
-    "codemirror": "~5.47.0"
+    "@jupyterlab/application": "^2.0.0",
+    "@jupyterlab/notebook": "^2.0.0",
+    "@jupyterlab/cells": "^2.0.0",
+    "codemirror": "~5.49.2"
   },
   "devDependencies": {
-    "@types/codemirror": "^0.0.74",
-    "typescript": "~3.5.1",
-    "rimraf": "~2.6.2"
+    "@types/codemirror": "^0.0.76",
+    "typescript": "~3.7.3",
+    "rimraf": "~3.0.0"
   },
   "jupyterlab": {
     "extension": true