Added Chunk.getWorld()

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/Chunk.java

@@ -20,4 +20,10 @@ public interface Chunk {
      */
     int getZ();
 
+    /**
+     * Gets the world containing this chunk
+     *
+     * @return Parent World
+     */
+    World getWorld();
 }