Upgrade nwjs to 0.49.2

package.nw/package.json

@@ -24,7 +24,7 @@
     "start": "run --mirror https://dl.nwjs.io/ ."
   },
   "build": {
-    "nwVersion": "0.48.4",
+    "nwVersion": "0.49.2",
     "targets": [
       "zip",
       "nsis7z"