v0.21.1

What's Changed

Fixed

• Refresh an expired authentication token for the calls of AuthClient too when automatic token refresh is enabled, except authenticate, by @belltoy in #126
• Send the authentication token to Cluster.MemberList. etcd 3.6 and later require it when authentication is enabled and refuse the request with user name is empty otherwise (observed on 3.6.15 and 3.7.2, while 3.5.26 does not require it), by @belltoy in #127
• Refresh an expired token once for concurrent calls instead of authenticating once per call, by @belltoy in #128

Full Changelog: v0.21.0...v0.21.1