remove mentions of "twitchio 2" and future promises

Author: IAmTomahawkx

docs/index.rst

@@ -7,7 +7,7 @@ Welcome to TwitchIO 2's Documentation!
 ========================================
 
 TwitchIO is an asynchronous Python wrapper around the Twitch API and IRC, with a powerful command extension for creating Twitch Chat Bots.
-TwitchIO 2 will cover 100% of the new Twitch API and will feature support for commands, PubSub and Webhooks.
+TwitchIO covers 100% of the new Twitch API and features support for commands, PubSub and Eventsub.
 
 Getting Started
 ------------------