* Add voter_chat to poll_answer event handling
The change ensures that when a poll_answer event is processed, the user context middleware now also returns the chat where the vote took place. Previously, only the user who cast the vote was returned.
* Added changelog
* Fixed tests
* Bump Python version in test
Three properties of the Bot class - parse_mode, disable_web_page_preview, and protect_content - have been marked as deprecated with proper warning messages. The associated tests have also been added to confirm the working of these deprecation warnings. Users are advised to use the updated alternatives specified in the warning messages.
Upgrade architecture + 5.0 Bot API (#469)
* Moved `methods`, `types` and `client` to root package
* Removed update handler from routers to dispatcher
* Reworked events propagation mechanism to handlers
* Reworked inner middlewares logic (very small change)
* Updated to Bot API 5.0
* Initial migration from MkDocs to Sphinx + config for readthedocs
