[in tools/server-side/svnpubsub/]

* svnpubsub/server.py
  (Client.write_start): Add the protocol version in a header, on the
    speculation that it might be useful.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1491707 13f79535-47bb-0310-9956-ffa450edef68