chore(package): update electron to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -81,7 +81,7 @@
     "cross-spawn": "^6.0.5",
     "css-loader": "^1.0.0",
     "devtron": "^1.4.0",
-    "electron": "^2.0.0",
+    "electron": "^3.0.0",
     "electron-builder": "^20.8.1",
     "electron-devtools-installer": "^2.2.0",
     "electron-reload": "^1.2.1",