install npm dep when building

Author: maximegris

package.json

@@ -20,7 +20,7 @@
     "lint": "ng lint",
     "start": "webpack --watch",
     "start:web": "webpack-dev-server --content-base . --port 4200 --inline",
-    "build:electron:main": "tsc main.ts --outDir dist && copyfiles package.json dist",
+    "build:electron:main": "tsc main.ts --outDir dist && copyfiles package.json dist && cd dist && npm install && cd ..",
     "build": "webpack --display-error-details && npm run build:electron:main",
     "build:prod": "cross-env NODE_ENV='production' npm run build",
     "electron:serve": "npm run build:electron:main && electron ./dist --serve",