Televerse v2.0.2 🚀

What's Changed

• Removed TeleverseEvent by @HeySreelal in #311

• 🆕 Supports Middleware chaining for each handler.
• ⚠️ Updated Conversation API definitions.
• 📖 Conversation API migration guide is available at website.
• Updated Fetcher implementations.
• Improved error wordings.
• Refactored bot.dart
• ⚠️ Removed Bot.on method & TeleverseEvent enum.

Full Changelog: v2.0.1...v2.0.2