fix one arg i bet

logb.go

@@ -65,7 +65,9 @@ func log(lvl Level, args ...interface{}) {
 	if len(args) > 0 {
 		args = append([]interface{}{}, args...)
 		v = fmt.Sprint(args)
-		v = v[1 : len(v)-1]
+		if len(args) > 1 {
+			v = v[1 : len(v)-1]
+		}
 	}
 	logf(lvl, "%s", v)
 }