update vanilla tsjs example

Author: johnnyreilly

examples/vanilla-jsts/package.json

@@ -3,12 +3,13 @@
   "main": "index.js",
   "version": "1.0.0",
   "scripts": {
-    "build": "webpack",
-    "watch": "webpack --watch"
+    "build": "webpack --mode production",
+    "watch": "webpack --watch --mode development"
   },
   "devDependencies": {
-    "ts-loader": "^3.0.3",
+    "ts-loader": "^4.0.0",
     "typescript": "^2.3.4",
-    "webpack": "^3.8.1"
+    "webpack": "^4.0.0",
+    "webpack-cli": "^2.0.9"
   }
 }