Bump protocol version

To reenable RTT-based metric, we usually want to force old nodes
to upgrade, so that they don't always look faster that others.

re6st/version.py

@@ -32,7 +32,7 @@ if dirty:
 # they are intended to the network admin.
 # Only 'protocol' is important and it must be increased whenever they would be
 # a wish to force an update of nodes.
-protocol = 5
+protocol = 6
 min_protocol = 1
 
 if __name__ == "__main__":