add -max param to gotail utility

cmd/gotail/gotail.go

@@ -12,7 +12,9 @@ import (
 func args2config() (tail.Config, int64) {
 	config := tail.Config{Follow: true}
 	n := int64(0)
+	maxlinesize := int(0)
 	flag.Int64Var(&n, "n", 0, "tail from the last Nth location")
+	flag.IntVar(&maxlinesize, "max", 0, "max line size")
 	flag.BoolVar(&config.Follow, "f", false, "wait for additional data to be appended to the file")
 	flag.BoolVar(&config.ReOpen, "F", false, "follow, and track file rename/rotation")
 	flag.BoolVar(&config.Poll, "p", false, "use polling, instead of inotify")
@@ -20,6 +22,7 @@ func args2config() (tail.Config, int64) {
 	if config.ReOpen {
 		config.Follow = true
 	}
+	config.MaxLineSize = maxlinesize
 	return config, n
 }