v0.14.0 - doctests, `Pane.send_keys()` change

Breaking changes

• [Pane.send_keys()](https://libtmux.git-pull.com/reference/panes.html#libtmux.Pane.send_keys): suppress_history default value changed from True to False, #395

Tests and docs

• Initial doctests examples stubbed out #394

• Fix bug in temp_window() context manager, #394

• Pytest configuration conftest.py moved to libtmux/conftest.py, so doctest can detect the fixtures #394

Automated PRs

• Basic doctest by @tony in #394
• refactor!(Pane.send_keys): Default suppress_history value to False by @tony in #395

Full Changelog: v0.13.0...v0.14.0