tool_help.h: update copyright year range

Follow-up from aa8777f63febca

diff --git a/src/tool_help.h b/src/tool_help.h
index 6c507d4cc91971254017b4d6cede9680e39ca70c..536ac10f81f1dddcc12e9d44dcfb6ca1c48d03b6 100644 (file)
--- a/src/tool_help.h
+++ b/src/tool_help.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms