Bump optional deps

Author: Rokt33r

package.json

@@ -188,7 +188,7 @@
     "webpack-dev-server": "^1.12.0"
   },
   "optionalDependencies": {
-    "grunt-electron-installer-debian": "^0.2.0",
+    "grunt-electron-installer-debian": "^0.5.0",
     "grunt-electron-installer-redhat": "^0.3.1"
   },
   "optional": false,