- update to 1.4.0:
* Updated from global requirements
* Add a nested_depth argument to poll_for_events
* Update the home-page in setup.cfg
* Standardize import format
* Remove unused function
* Change usage of _auth_url private attribute
* Remove discover from test-requirements
* Add support for stack file list
* Trivial: Remove out-of-date and useless example
* Add Python 3.5 classifier and venv
* Fix doc build if git is absent
* Fix deprecation message for stack-preview
* Remove unused LOG
* Remove white space between print and ()
* base.Resource not define __ne__() built-in function
* Fix typo
* Pass correct arguments in osc plugin
* Use osc_lib instead of cliff
* Use osc-lib instead of openstackclient
* Imported Translations from Zanata
* Enhance error message
* Replace dict.iteritems with six.iteritems to make PY3 compatible
* Show 'deletion_time' of stacks
* Implement client side of event list --nested-depth
* Refactor test_shell
* Serialize files when using SessionClient
* Show 'parameter_defaults' for environment-show
* A resource list formatter for graphviz dot diagrams
* Implement "openstack stack failures list"