Four changes:

• Now uses NametagEdit for nametag support, as it is updated more often and is much more popular (likely to remain supported)
• Compiled against Spigot API 1.20.2 to ensure compatibility*
• Uploaded source to GitHub
• Cleaned up code a little bit based on the IDE's suggestions

*I set the API version to 1.20 in the plugin.yml. Let me know if this breaks compatibility with older versions, because I am not sure whether this is a hard minimum or not.