Convert vision_status to event loops

Change-Id: I06c329f3fe42d2dbfa7da90d598c93eacdf746c7
diff --git a/y2018/vision/vision.q b/y2018/vision/vision.q
index a3b57ea..fb59d69 100644
--- a/y2018/vision/vision.q
+++ b/y2018/vision/vision.q
@@ -1,7 +1,7 @@
 package y2018.vision;
 
+// Published on ".y2018.vision.vision_status"
 message VisionStatus {
   uint32_t high_frame_count;
   uint32_t low_frame_count;
 };
-queue VisionStatus vision_status;