fix(demo): upgraded typescript to v3.2.2

Author: AnthonyNahas

demo/package-lock.json

@@ -76,7 +76,7 @@
     "ts-loader": "^5.3.3",
     "ts-node": "^7.0.1",
     "tslint": "~5.11.0",
-    "typescript": "~3.1.6",
+    "typescript": "~3.2.2",
     "webpack-cli": "^3.2.1",
     "yargs": "12.0.1"
   },