Request: Add TUNA to mirror list of lyx

[Jiajie Chen]

To LyX admins:
                TUNA Mirrors (清华大学开源软件镜像站 
https://mirrors.tuna.tsinghua.edu.cn/) is providing LyX mirror for users in 
P.R. China. I am writing to request to add TUNA to mirror list of LyX like this:

                清华大学开源软件镜像站 (https) (China)

            With the link to LyX mirror to be 
https://mirrors.tuna.tsinghua.edu.cn/lyx/ .


Best regards,
Chen