Prepare auto-update

package.json

@@ -10,6 +10,10 @@
     "test-backend": "cd backend && npm run test && cd ..",
     "release": "npm run test && ./release.sh"
   },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/thomasnordquist/MQTT-Explorer.git"
+  },
   "build": {
     "appId": "mqtt-explorer",
     "mac": {
@@ -56,8 +60,10 @@
   "dependencies": {
     "@types/electron": "^1.6.10",
     "@types/socket.io": "^2.1.2",
-    "socket.io": "^2.2.0",
+    "electron-log": "^2.2.17",
+    "electron-updater": "^4.0.6",
     "mqtt": "^2.18.8",
-    "sha1": "^1.1.1"
+    "sha1": "^1.1.1",
+    "socket.io": "^2.2.0"
   }
 }