qapi: Fix COLOStatus and query-colo-status since version

This structure and command have missed qemu version 3.0, so fix it to since version 3.1.

Signed-off-by: Zhang Chen <zhangckid@gmail.com>
Message-Id: <20181022164118.5502-1-zhangckid@gmail.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
diff --git a/qapi/migration.json b/qapi/migration.json
index 0928f4b..38d4c41 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1317,7 +1317,7 @@
 #
 # @reason: describes the reason for the COLO exit.
 #
-# Since: 3.0
+# Since: 3.1
 ##
 { 'struct': 'COLOStatus',
   'data': { 'mode': 'COLOMode', 'reason': 'COLOExitReason' } }
@@ -1334,7 +1334,7 @@
 # -> { "execute": "query-colo-status" }
 # <- { "return": { "mode": "primary", "active": true, "reason": "request" } }
 #
-# Since: 3.0
+# Since: 3.1
 ##
 { 'command': 'query-colo-status',
   'returns': 'COLOStatus' }