fix(package): updated typescript to v2.9.2

Author: AnthonyNahas

demo/package-lock.json

@@ -83,7 +83,7 @@
     "ts-loader": "^4.5.0",
     "ts-node": "^7.0.1",
     "tslint": "~5.11.0",
-    "typescript": "~2.7.2",
+    "typescript": "~2.9.2",
     "webpack-cli": "^3.1.0",
     "yargs": "^12.0.1"
   },