A lot of changes internal to the plugin to support Spigot 1.13 and 1.13.1 fully. Most notably, changes to better support the legacy and new material API. Some changes to the exposed API have been made, so depending plugins may have to be updated to support these changes.

Highlights

• Adds support for Spigot 1.13 and 1.13.1
• Some bugfixes supporting spigot 1.8 - 1.8.8

Changes

• [Added] Support for Spigot 1.13 and 1.13.1
  
• [Fixed] Error updating metadata of entities on some versions of Minecraft because of incorrect Optional handling
• [Fixed] Map display items not preserving state when protocollib is not installed
• [Added] Helper method for spawning colored redstone dust particles
• [Added] EntityType setters for entity spawn packets, avoiding the need to use entity type id's
• [Fixed] Performance enhancements in BlockData API, EntityMoveHandler and sendPacket
• [Added] Basic support for NMS HeightMap logic
• [Added] MaterialUtil getMaterial functions to access legacy material types safely