Namedpipe

Changed
- Dropped support for py3.7
- Removed unnecessary dependency `"typing_extensions;python_version<'3.8'"`

Fixed

- Reverted the use of the new Union type hint (|) unsupported in py3.8 to old `Union[]` syntax [issue1;issue2]

Initial release

[unreleased]: https://github.com/python-ffmpegio/python-namedpipe/compare/v0.1.0...HEAD