Log Message:
py-poyo: updated to 0.5.0

0.5.0
Features
* Add support for multiline strings

    ```yaml
    longtext: >
        This is a multiline string.
        It can contain all manners of characters.

        Single line breaks are ignored,
        but blank linkes cause line breaks.
    ```

Bugfixes
* Fix link to poyo on PyPI
* Trim trailing whitespace in variable

Improvements
* Update project to use src directory
* Convert rst files to md
* Reformat code base with black