nginx 1.17.6发布

nginx 1.17.6 发布了，更新内容：

Feature

• the $proxy_protocol_server_addr and  $proxy_protocol_server_port variables.
• the "limit_conn_dry_run" directive.
• the $limit_req_status and $limit_conn_status variables.

更新日志：

http://nginx.org/en/CHANGES