Fix
* Use bytes instead of to_bytes in pyav metadata call ([1100](https://github.com/imageio/imageio/issues/1100)) ([`4a5c4b5`](https://github.com/imageio/imageio/commit/4a5c4b5ca4c18672332695828ff4db2e66a0252c))
Feature
* Remove support for Python 3.8 ([1102](https://github.com/imageio/imageio/issues/1102)) ([`f017778`](https://github.com/imageio/imageio/commit/f017778434614b1f03c5df75f0e5f0b5560f86a5))