Prepare electron releases

app/package.json

@@ -4,20 +4,20 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "build": "webpack --mode production"
+    "build": "webpack --mode production",
+    "postinstall": "npm run build"
   },
   "author": "",
   "license": "ISC",
-  "devDependencies": {
+  "devDependencies": {},
+  "dependencies": {
     "@types/node": "^10.12.18",
     "awesome-typescript-loader": "^5.2.1",
     "source-map-loader": "^0.2.4",
     "typescript": "^3.2.2",
     "webpack": "^4.28.2",
     "webpack-cli": "^3.1.2",
-    "webpack-dev-server": "^3.1.14"
-  },
-  "dependencies": {
+    "webpack-dev-server": "^3.1.14",
     "@material-ui/core": "^3.7.1",
     "@types/react": "^16.7.18",
     "@types/react-dom": "^16.0.11",