updated electron version to 4.0.1

updated electron version in devDependencies from 3.0.7 to 4.0.1

package.json

@@ -17,6 +17,6 @@
   "author": "GitHub",
   "license": "CC0-1.0",
   "devDependencies": {
-    "electron": "^3.0.7"
+    "electron": "^4.0.1"
   }
 }