* Avoid logging a warning when config does not specify a
backend.
* When parsing keyring_path from the config, the home directory
is now expanded from ~.
* In get_credential, now returns None when the indicated
username is not found.
* Fixed ValueError for AnonymousCredentials in CLI.
* Refined type spec and interfaces on credential objects.
Introduced AnonymousCredential to model a secret without a
username.
* Deprecated support for empty usernames. Now all backends will
reject an empty string as input for the 'username' field when
setting a password. Later this deprecation will become a more
visible user warning and even later an error. If this warning
is triggered in your environment, please consider using a
static value (even 'username') or comment in the issue and
describe the use-case that demands support for empty
usernames.
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-keyring?expand=0&rev=139
