Fix lint errors

client/middle.go

@@ -8,6 +8,8 @@ import (
 	"github.com/9seconds/mtg/wrappers"
 )
 
+// MiddleInit initializes client connection for proxy which has to
+// support promoted channels, connect to Telegram middle proxies etc.
 func MiddleInit(socket net.Conn, connID string, conf *config.Config) (wrappers.Wrap, *mtproto.ConnectionOpts, error) {
 	conn, opts, err := DirectInit(socket, connID, conf)
 	if err != nil {