title: yarn set registry failed, how to reset it?
body: <p>I want to set registry to "<a href="https://registry.npm.taobao.org" rel="nofollow noreferrer">https://registry.npm.taobao.org</a>", but it seems failed.
  How to set the registry to the default value.
  <a href="https://i.stack.imgur.com/Ldta2.png" rel="nofollow noreferrer">enter image description here</a></p>