Fix deps in typescript example, remove postinstall

Author: Jared Palmer

examples/with-typescript/package.json

@@ -4,14 +4,11 @@
   "scripts": {
     "start": "node ./build/main.js",
     "dev": "backpack dev",
-    "build": "backpack build",
-    "postinstall": "backpack build"
+    "build": "backpack build"
   },
   "license": "MIT",
   "dependencies": {
-    "express": "^4.14.0"
-  },
-  "devDependencies": {
+    "express": "^4.14.0",
     "@types/express": "^4.0.34",
     "awesome-typescript-loader": "^3.0.0-beta.18",
     "backpack-core": "0.0.7",