feat(autoupdate): autoupdate on statup

package.json

@@ -29,7 +29,9 @@
     "directories": {
       "buildResources": "resources"
     },
-    "publish": null,
+    "publish": {
+      "provider": "github"
+    },
     "win": {
       "extraFiles": [
         {
@@ -75,6 +77,7 @@
     "debug": "^3.1.0",
     "diskusage": "^0.2.4",
     "electron-context-menu": "^0.9.1",
+    "electron-updater": "^2.20.1",
     "fs-jetpack": "^1.2.0",
     "iconv-lite": "^0.4.19",
     "ipaddr.js": "^1.5.4",