• Added events that can be used to program your own plugins:
  • AddRegionEvent
  • BuyRegionEvent
  • ExtendRegionEvent
  • RemoveRegionEvent
  • ResetBlocksEvent
  • UnsellRegionEvent
  • UpdateRegionEvent
• Presets will now be saved with the new YamlFileManager
• Messages will now only be saved if it is necessary
• Added new system to detect default Materials for different Minecraft server versions
• ARM is now compatible with all Minecraft Server versions between 1.12 and 1.13
• fixed some bugs

I know the first dev builds of Minecraft 1.14 are out. ARM is currently not compatible with the 1.14 version. You can try to use it, but if you do don't use wallsigns.