Release v2.1.0-beta1

Merge branch 'master' into 2.1-merge

Release v2.0.22

Fixed bug that worker will be stoped when `onMessage` or `onClose` fa…

Release v2.0.18

Fixed memory leak when websocket hande shake failed. (#2768)

* 修复websocket握手失败不会释放WsContext中set的值而导致内存泄漏的问题

* Update Server.php

* Update CHANGELOG-2.0.md

Co-authored-by: 李铭昕 <715557344@qq.com>

Release v2.0.13

fix typo and ambiguous expression (#2569)

* fix typo and ambiguous expression

* fix typo

* update questions with zirocte/swagger 3.0.5 version issue