3.0.0 - Go rewrite

This is the first version of the bot in the Go programming language.

Added

• Added icons showing the type of lesson
• Added new type of classes notifications: Next classes part
• Added command aliases
• Added support for selecting a group via its name: /group ФІТ 3-8

Changed

• The commands have been reworked a bit
• Improved the page with additional lesson info
• Reworked bot database, added selection of postgresql/file system DB type
• The /left command now scans 7 days instead of 1
• Removed Easter statistics menu called via /empty_1 command

What's Changed

• New notification type: next classes part by @cubicbyte in #14

Full Changelog: v2.3.0...3.0.0