Update swagger spec

priv/static/swagger.json

@@ -147,7 +147,7 @@
     },
     "/api/events/filter": {
       "post": {
-        "description": "",
+        "description": "  Returns a list of events matching the filter in descending order of created_at time.\n  Response is returned as a batch, not streamed, so a `limit` parameter is required to prevent\n  the response from getting too large.\n",
         "operationId": "query_events",
         "parameters": [],
         "responses": {