build: allow $zh scope in commitlint (#2278)

Co-authored-by: Nmeteorlxy <meteor.lxy@foxmail.com>

.commitlintrc.js

@@ -13,6 +13,7 @@ module.exports = {
       'always',
       [
         'cli',
+        'zh',
         ...VuepressPackages
       ].map(name => `$${name}`)
     ]