Update electron-builder to the latest version 🚀 (#36)

* chore(package): update electron-builder to version 19.49.4

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeper[bot]

package-lock.json

@@ -83,7 +83,7 @@
   },
   "devDependencies": {
     "electron": "1.7.10",
-    "electron-builder": "19.49.2",
+    "electron-builder": "19.49.4",
     "electron-rebuild": "1.6.0",
     "minifier": "0.8.1",
     "node-json-minify": "1.0.0",