v2.6.7

Here's a summary of the changes:

• Only supported for Lavalink v4.0.0 or above
• Added thumbnail in nowplaying embed
• Added UA language pack
• Added helpful guide embed when your command was missing arguments
• Dump discord.py package update (2.3.1 -> 2.3.2)
• Fixed seek function in dashboard
• Fixed playlist playback fix
• Code clean-up and performance improvement

Update Command:

• Rewrite debugging command

Full Changelog: v2.6.6 to v2.6.7