$ ./run-tests.sh
Skipped 1 files
lists of files in version control and sdist match
Warning, treated as error:
WARNING: intersphinx inventory 'http://flask.pocoo.org/docs/objects.inv' not fetchable due to <class 'urllib2.HTTPError'>: HTTP Error 403: Forbidden
The command "./run-tests.sh" exited with 1.
https://travis-ci.org/inveniosoftware/flask-breadcrumbs/jobs/656676424
Fix also Travis deprecation: https://travis-ci.org/inveniosoftware/flask-breadcrumbs/jobs/656676424/config