Add arch flag for universal mac builds

Author: morajabi

Diff for: package.json

@@ -8,7 +8,7 @@
     "clean": "cmake-js clean",
     "patch": "node ./patch-packagename.js",
     "build:debug": "cmake-js rebuild --debug",
-    "build:release": "cmake-js rebuild",
+    "build:release": "cmake-js rebuild --CDCMAKE_OSX_ARCHITECTURES=\"arm64;x86_64\"",
     "prepublishOnly": "npm run build:release",
     "publish:next": "npm publish --tag next"
   },