added prisma generate to build process

Author: fawredd

package.json

@@ -7,7 +7,8 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "build": "prisma generate && node index.js",
-    "dev": "nodemon index.js"
+    "dev": "nodemon index.js",
+    "postinstall": "prisma generate"
   },
   "repository": {
     "type": "git",