Upgrade electron-builder

package.json

@@ -48,8 +48,8 @@
     "css-loader": "^0.28.9",
     "devtron": "^1.4.0",
     "electron": "1.8.4",
-    "electron-builder": "17.4.0",
-    "electron-builder-squirrel-windows": "17.4.0",
+    "electron-builder": "20.8.1",
+    "electron-builder-squirrel-windows": "~20.8.0",
     "electron-connect": "^0.6.3",
     "eslint": "^4.18.0",
     "eslint-plugin-import": "^2.8.0",