Nextcord.py

What's Changed
* Fix member.edit without a timeout raising an error
* add scheduled events
* update to API version 9
* Add 'thread' field to messages

**Full Changelog**: https://github.com/nextcord/nextcord/compare/2.0.0a5...2.0.0a6

- Added slash commands
- General typing fixes
- Added spammer user flag
- Added timeouts
- Default role mentions are now `everyone` not `everyone`
- Support for animated guild banners

- Fix typings e.g. on_guild_channel_pins_update
- Tasks.loop bugfix if current day has passed
- Bump aiohttp dependency to allow 3.8+
- Interaction.send helper method for responding or sending
- Commands group hook inheritance for child commands
- Fix the permissions issue when iterating over a permission object
- Prefer static_format over format with static assets
- Fix VoiceClient aliasing not working as intended