add caching and improve (fixes some bugs) (#16)

* Enhance caching logic for chat member retrieval

- Implemented TTLCache for storing chat members with a 30-minute expiration.
- Utilized caching to reduce API calls and improve performance.

* improved code with reduced duplication

* bump version

Update setup.py to allow any version of dependencies

stable: `v2.3.9`

> new username

bumb version: 2.3.9b1

fix: Development Status

bumb version

bumb version

lol