New episode system:
The old episode system got replaced, in the new one you will be able to set the time between episodes and add placeholders for episode number and time until next episode to the scoreboard.
If you want to start using it and want to keep your old config, change:
To
Bug fixes:

• Fixed bug where in 1.13-1.14 schemetics would not always load.
• Fixed the enderdragon end sound for 1.9-1.12
• Added placeholders for the scoreboard, all placeholders shown in the top section of your scoreboard.yml will now work.
  
• Fixed errors.