Provide mocker.call name

[jhermann]

In order to use the assert_has_calls check, you need the call name. I think it should be part of the set of 'convenience' names available via mocker.

The end goal is to make this work::

get_pwd = mocker.patch('keyring.get_password')
…
get_pwd.assert_has_calls(
    mocker.call(Credentials.KEYRING_SERVICE_DEFAULT, '[email protected]'),
    mocker.call(Credentials.KEYRING_SERVICE_DEFAULT, 'keyring.example.com'))

If you agree it should be available, I can do a PR.

[nicoddemus]

Sure, sounds good. A PR would be appreciated! 😁

Just a heads up before you contribute: the license for the new yet to be released version is now MIT (#45).