SPIGOT-5559: Add EntityPotionEffectEvent causes for PATROL_CAPTAIN and WITHER_ROSE

By: ShaneBee <shanebolenback@me.com>

paper-api/src/main/java/org/bukkit/event/entity/EntityPotionEffectEvent.java

@@ -213,6 +213,10 @@ public class EntityPotionEffectEvent extends EntityEvent implements Cancellable
          * When all effects are removed due to a bucket of milk.
          */
         MILK,
+        /**
+         * When a player gets bad omen after killing a patrol captain.
+         */
+        PATROL_CAPTAIN,
         /**
          * When a potion effect is modified through the plugin methods.
          */
@@ -244,6 +248,10 @@ public class EntityPotionEffectEvent extends EntityEvent implements Cancellable
         /**
          * When a villager gets regeneration after a trade.
          */
-        VILLAGER_TRADE
+        VILLAGER_TRADE,
+        /**
+         * When an entity comes in contact with a wither rose.
+         */
+        WITHER_ROSE
     }
 }