remove unused Event.ID.CollectionEnd
diff --git a/src/main/java/org/yaml/snakeyaml/events/CollectionEndEvent.java b/src/main/java/org/yaml/snakeyaml/events/CollectionEndEvent.java
index 0512f7b..e4d5462 100644
--- a/src/main/java/org/yaml/snakeyaml/events/CollectionEndEvent.java
+++ b/src/main/java/org/yaml/snakeyaml/events/CollectionEndEvent.java
@@ -25,9 +25,4 @@
     public CollectionEndEvent(Mark startMark, Mark endMark) {
         super(startMark, endMark);
     }
-
-    @Override
-    public boolean is(ID id) {
-        return ID.CollectionEnd == id;
-    }
 }
diff --git a/src/main/java/org/yaml/snakeyaml/events/Event.java b/src/main/java/org/yaml/snakeyaml/events/Event.java
index 52f9811..8aad415 100644
--- a/src/main/java/org/yaml/snakeyaml/events/Event.java
+++ b/src/main/java/org/yaml/snakeyaml/events/Event.java
@@ -23,7 +23,7 @@
  */
 public abstract class Event {
     public enum ID {
-        Alias, CollectionEnd, CollectionStart, DocumentEnd, DocumentStart, MappingEnd, MappingStart, Scalar, SequenceEnd, SequenceStart, StreamEnd, StreamStart
+        Alias, CollectionStart, DocumentEnd, DocumentStart, MappingEnd, MappingStart, Scalar, SequenceEnd, SequenceStart, StreamEnd, StreamStart
     }
 
     private final Mark startMark;