Mac Build Setting

- Set build target to `pkg` for `macOS` build settings to avoid `dmg` build failure caused by no support for 32-bit apps on `macOS 10.15+`. Refer to `Known issues` section in `README` for more details.

Author: iamWing

package.json

@@ -18,6 +18,9 @@
       "app": "./dist/",
       "output": "./out/"
     },
+    "mac": {
+      "target": "pkg"
+    },
     "win": {
       "target": "nsis",
       "asar": false