Add a change log after previous enhancements.

Signed-off-by: Changbin Du <changbin...@gmail.com>
---
 tools/perf/builtin-ftrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 9da38dc8b542..167f1f57aba3 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -3,6 +3,7 @@
  * builtin-ftrace.c
  *
  * Copyright (c) 2013  LG Electronics,  Namhyung Kim <namhy...@kernel.org>
+ * Copyright (c) 2020  Changbin Du <changbin...@gmail.com>, significant 
enhancement.
  */
 
 #include "builtin.h"
-- 
2.25.1

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