jormungandr: small change to manage different flask version
jormungandr: small change to manage different flask version

lrocheWB/navitia,Tisseo/navitia,lrocheWB/navitia,kinnou02/navitia,antoine-de/navitia,pbougue/navitia,Tisseo/navitia,kinnou02/navitia,Tisseo/navitia,CanalTP/navitia,antoine-de/navitia,patochectp/navitia,xlqian/navitia,kinnou02/navitia,pbougue/navitia,CanalTP/navitia,ballouche/navitia,antoine-de/navitia,xlqian/navitia,patochectp/navitia,pbougue/navitia,Tisseo/navitia,patochectp/navitia,xlqian/navitia,patochectp/navitia,xlqian/navitia,xlqian/navitia,CanalTP/navitia,ballouche/navitia,pbougue/navitia,ballouche/navitia,kadhikari/navitia,CanalTP/navitia,lrocheWB/navitia,ballouche/navitia,kadhikari/navitia,Tisseo/navitia,kinnou02/navitia,antoine-de/navitia,kadhikari/navitia,CanalTP/navitia,kadhikari/navitia,lrocheWB/navitia