Support for HAProxy socket sender?

I see you guys implemented native support for OpenResty NGINX socket types as well as luasocket:

https://github.com/cloudflare/raven-lua/blob/master/raven/senders/

We use Lua in HAProxy which has its own Socket class implementation (compatible with the Lua Socket class) due to the non-blocking nature of HAProxy:

https://www.arpalert.org/src/haproxy-lua-api/2.3/index.html#socket-class

Would you consider a PR that adds a sender for this type of socket as well? Otherwise we cannot use this library as it will block our Lua scripts' operations.