update README.md

Author: 刘鹏威

README.md

@@ -21,7 +21,7 @@ Vue.use(require('vue-cookies'))
 import Vue from 'vue'
 import VueCookies from 'vue-cookies'
 
-// default options: { expires: '1d', path: '/', domain: '', secure: '', sameSite: 'Lax' }
+// default options config: { expires: '1d', path: '/', domain: '', secure: '', sameSite: 'Lax' }
 Vue.use(VueCookies, { expire: '7d'})
 
 ```