fix: start with keepalive_ready being true since socket is empty before requests are made

Author: GuyLewin

lib/resty/http.lua

@@ -135,7 +135,7 @@ function _M.new(_)
         return nil, err
     end
     return setmetatable({
-        sock = sock, keepalive_supported = true, keepalive_ready = false, pool_only_after_response = false
+        sock = sock, keepalive_supported = true, keepalive_ready = true, pool_only_after_response = false
     }, mt)
 end