- update to 0.11.3:
* Add PEP 561 `py.typed` marker file.
* Re-organize unit tests.
* Add a warning about the usage of `.new_instances()` method in
the documentation.
* Run tests with testtools, subunit, TeamCity, and doctest
testrunners using tox.
* Test flexmock API examples using doctest.
* Re-add Sphinx support for generating man pages.
* Fix 404 page not loading CSS and Javascript resources in
documentation.
* Add Python 3.8, 3.9, 3.10, and 3.11 support.
* Add type annotations.
* **BREAKING CHANGE**: Flexmock needs to be imported explicitly
using `from flexmock import flexmock`.
* Many error messages have been improved.
* Drop Python 2.7, 3.4, 3.5 support.
* Drop Pytest 4.x support.
* **BREAKING CHANGE**: Removed support for calling `once`,
`twice`, `never`, and `mock` methods without parentheses.
* Fix `should_call` is broken if called on a fake object.
* Fix `and_raise` allows invalid arguments for an exception.
* Fix AttributeError raised when mocking a proxied object.
* Fix flexmock not mocking methods properly on derived classes.

* Fix with_args not working built-in functions.
- Initial package