Added the -all flag for /btshuffle
- If you want to include all offline players in the shuffling process, use -all instead of typing their nicknames.
Fixed a few design issues.
You should make a backup of your teams.yml file, and delete the BetterTeaming-1.15 folder. It may now recognize the folder now. After the plugin recreates the folder, you can just replace the new teams.yml with your old one.