fix(package): update electron-packager to version 14.0.3

Closes #31

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
   "homepage": "https://github.com/stealjs/steal-electron",
   "dependencies": {
     "cheerio": "^1.0.0-rc.2",
-    "electron-packager": "^8.5.0",
+    "electron-packager": "^14.0.3",
     "fs-extra": "^4.0.1",
     "pdenodeify": "^0.1.0"
   },