[mod-security-users] Note for nginx on download page

[Shigeya T. <ta...@na...>]

Hi all,

https://modsecurity.org/download.html
In the bottom of the download page, there is a note for nginx.

NOTE: Some instabilities in the Nginx add-on have been reported (see the
Github issues page for details). Please use the "nginx_refactoring" branch
where possible for the most up to date version and stay tuned for the
ModSecurity version 4.

It it still true and should wait for version 4 or already resolved as of
version 3? "nginx_refactoring" branch looks not active now.