v0.1.6

Changelog

• 9279157 - support check cache - optimize check?host= as concurrent, send to background - support load exists cert firstly when tls enabled
• c3381fe add default timeout
• bf5e6e9 add worker pool
• c256638 解决http代理请求返回status的问题
• 9238c02 解决奔溃的问题