add doc/releases/5.0.4.md

doc/releases/5.0.4.md

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+## What's Changed
+
+- Fix regression in `glossary_v2.py` effecting deprecated `Glossary` usage
+- Fix docstring for `glossary_v2.Glossary.write` method
+- Fix broken script `scripts/view-glossary-plaintext`
+- Feature: include `write_options` in `.info` file with `--info` flag
+- Testing: fix `scripts/test.sh` not testing deprecated stuff
+- Testing: fix deprecated tests
+- Testing: add `SKIP_MISSING` env var to skip testing plugins with missing dependencies
+- Fix / update automation scripts
+- Add recent releases' doc
+- Improve and refactor type annotations
+- Break up all plugins into directories (with `reader.py` and/or `writer.py`)
+- Fix ruff 0.8.5 errors
+- Some refactoring (as usual)
+
+**Full Changelog**: https://github.com/ilius/pyglossary/compare/5.0.3...5.0.4