minor fix, remove trailing comma

dispatcher/s3_to_db.sh

@@ -16,7 +16,7 @@ psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-E
         "bucket_name"  varchar(256) NOT NULL UNIQUE,
         "thing_uuid"   uuid         NOT NULL,
         "thing_name"   varchar(256) NOT NULL,
-        "db_url"       varchar(256) NOT NULL,
+        "db_url"       varchar(256) NOT NULL
     );
 
     GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA $S3MAP_POSTGRES_USER TO $S3MAP_POSTGRES_USER;