git: contrib/tcpdump: Update README.DRAGONFLY

[Aaron LI]

commit e142722185005e7fb5125476c1da919b89da1308
Author: Aaron LI <aly at aaronly.me>
Date:   Sun May 17 15:36:33 2020 +0800

    contrib/tcpdump: Update README.DRAGONFLY

Summary of changes:
 contrib/tcpdump/README.DRAGONFLY | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/e142722185005e7fb5125476c1da919b89da1308


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