fix(custom): add subpackage,plugin

packages/vue-cli-plugin-uni/lib/commands/custom.js

@@ -30,9 +30,11 @@ module.exports = function custom (argv) {
   service.run(command, {
     watch: process.env.NODE_ENV === 'development',
     minimize: process.env.UNI_MINIMIZE === 'true',
-    clean: false
+    clean: false,
+    subpackage: argv.subpackage,
+    plugin: argv.plugin
   }).catch(err => {
     console.error(err)
     process.exit(1)
-  })
+  })
 }