changelog: Document protocol incompatibility
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Sun, 8 Sep 2019 21:51:14 +0000 (22:51 +0100)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Sun, 8 Sep 2019 21:51:14 +0000 (22:51 +0100)
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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