Added support for labels in webhook events (#325).

src/main/java/org/gitlab4j/api/webhook/IssueEvent.java

 package org.gitlab4j.api.webhook;
 
+import java.util.List;
+
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 
@@ -17,7 +19,10 @@ public class IssueEvent extends AbstractEvent {
     private EventProject project;
     private EventRepository repository;
     private ObjectAttributes objectAttributes;
+    private List<Assignee> assignees;
     private Assignee assignee;
+    private List<EventLabel> labels;
+    private EventChanges changes;
 
     public String getObjectKind() {
         return (OBJECT_KIND);
@@ -52,6 +57,14 @@ public class IssueEvent extends AbstractEvent {
         this.repository = repository;
     }
 
+    public List<Assignee> getAssignees() {
+        return assignees;
+    }
+
+    public void setAssignees(List<Assignee> assignees) {
+        this.assignees = assignees;
+    }
+
     public Assignee getAssignee() {
         return assignee;
     }
@@ -60,6 +73,22 @@ public class IssueEvent extends AbstractEvent {
         this.assignee = assignee;
     }
 
+    public List<EventLabel> getLabels() {
+        return labels;
+    }
+
+    public void setLabels(List<EventLabel> labels) {
+        this.labels = labels;
+    }
+
+    public EventChanges getChanges() {
+        return changes;
+    }
+
+    public void setChanges(EventChanges changes) {
+        this.changes = changes;
+    }
+
     public ObjectAttributes getObjectAttributes() {
         return this.objectAttributes;
     }

src/main/java/org/gitlab4j/api/webhook/MergeRequestEvent.java

 package org.gitlab4j.api.webhook;
 
+import java.util.List;
+
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 
@@ -16,6 +18,8 @@ public class MergeRequestEvent extends AbstractEvent {
     private EventProject project;
     private EventRepository repository;
     private ObjectAttributes objectAttributes;
+    private List<EventLabel> labels;
+    private EventChanges changes;
 
     public String getObjectKind() {
         return (OBJECT_KIND);
@@ -58,6 +62,22 @@ public class MergeRequestEvent extends AbstractEvent {
         this.objectAttributes = objectAttributes;
     }
 
+    public List<EventLabel> getLabels() {
+        return labels;
+    }
+
+    public void setLabels(List<EventLabel> labels) {
+        this.labels = labels;
+    }
+
+    public EventChanges getChanges() {
+        return changes;
+    }
+
+    public void setChanges(EventChanges changes) {
+        this.changes = changes;
+    }
+
     @XmlAccessorType(XmlAccessType.FIELD)
     public static class ObjectAttributes extends EventMergeRequest {
     }

src/test/resources/org/gitlab4j/api/issue-event.json

@@ -41,9 +41,56 @@
     "url": "http://example.com/diaspora/issues/23",
     "action": "open"
   },
+   "assignees": [{
+    "name": "User1",
+    "username": "user1",
+    "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=40\u0026d=identicon"
+  }],
   "assignee": {
     "name": "User1",
     "username": "user1",
     "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=40\u0026d=identicon"
+  },
+  "labels": [{
+    "id": 206,
+    "title": "API",
+    "color": "#ffffff",
+    "project_id": 14,
+    "created_at": "2013-12-03T17:15:43Z",
+    "updated_at": "2013-12-03T17:15:43Z",
+    "template": false,
+    "description": "API related issues",
+    "type": "ProjectLabel",
+    "group_id": 41
+  }],
+  "changes": {
+    "updated_by_id": [null, 1],
+    "updated_at": ["2017-09-15T16:50:55Z", "2017-09-15T16:52:00Z"],
+    "labels": {
+      "previous": [{
+        "id": 206,
+        "title": "API",
+        "color": "#ffffff",
+        "project_id": 14,
+        "created_at": "2013-12-03T17:15:43Z",
+        "updated_at": "2013-12-03T17:15:43Z",
+        "template": false,
+        "description": "API related issues",
+        "type": "ProjectLabel",
+        "group_id": 41
+      }],
+      "current": [{
+        "id": 205,
+        "title": "Platform",
+        "color": "#123123",
+        "project_id": 14,
+        "created_at": "2013-12-03T17:15:43Z",
+        "updated_at": "2013-12-03T17:15:43Z",
+        "template": false,
+        "description": "Platform related issues",
+        "type": "ProjectLabel",
+        "group_id": 41
+      }]
+    }
   }
 }
\ No newline at end of file

src/test/resources/org/gitlab4j/api/merge-request-event.json

@@ -90,5 +90,47 @@
       "username": "user1",
       "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=40\u0026d=identicon"
     }
+  },
+   "labels": [{
+    "id": 206,
+    "title": "API",
+    "color": "#ffffff",
+    "project_id": 14,
+    "created_at": "2013-12-03T17:15:43Z",
+    "updated_at": "2013-12-03T17:15:43Z",
+    "template": false,
+    "description": "API related issues",
+    "type": "ProjectLabel",
+    "group_id": 41
+  }],
+  "changes": {
+    "updated_by_id": [null, 1],
+    "updated_at": ["2017-09-15T16:50:55Z", "2017-09-15T16:52:00Z"],
+    "labels": {
+      "previous": [{
+        "id": 206,
+        "title": "API",
+        "color": "#ffffff",
+        "project_id": 14,
+        "created_at": "2013-12-03T17:15:43Z",
+        "updated_at": "2013-12-03T17:15:43Z",
+        "template": false,
+        "description": "API related issues",
+        "type": "ProjectLabel",
+        "group_id": 41
+      }],
+      "current": [{
+        "id": 205,
+        "title": "Platform",
+        "color": "#123123",
+        "project_id": 14,
+        "created_at": "2013-12-03T17:15:43Z",
+        "updated_at": "2013-12-03T17:15:43Z",
+        "template": false,
+        "description": "Platform related issues",
+        "type": "ProjectLabel",
+        "group_id": 41
+      }]
+    }
   }
 }
\ No newline at end of file