Added support for assignees (#536)

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

 package org.gitlab4j.api.webhook;
 
 import java.util.Date;
+import java.util.List;
 import java.util.Map;
 
 import org.gitlab4j.api.models.Assignee;
@@ -58,6 +59,7 @@ public class EventMergeRequest {
     private Duration humanTotalTimeSpent;
     private Integer timeEstimate;
     private Duration humanTimeEstimate;
+    private List<Integer> assigneeIds;
 
     public Integer getAssigneeId() {
         return this.assigneeId;
@@ -427,6 +429,14 @@ public class EventMergeRequest {
         this.humanTimeEstimate = humanTimeEstimate;
     }
 
+    public List<Integer> getAssigneeIds() {
+        return assigneeIds;
+    }
+
+    public void setAssigneeIds(List<Integer> assigneeIds) {
+        this.assigneeIds = assigneeIds;
+    }
+
     @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));

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

@@ -2,6 +2,7 @@ package org.gitlab4j.api.webhook;
 
 import java.util.List;
 
+import org.gitlab4j.api.models.Assignee;
 import org.gitlab4j.api.models.User;
 import org.gitlab4j.api.utils.JacksonJson;
 
@@ -16,6 +17,7 @@ public class MergeRequestEvent extends AbstractEvent {
     private ObjectAttributes objectAttributes;
     private List<EventLabel> labels;
     private MergeRequestChanges changes;
+    private List<Assignee> assignees;
 
     public String getObjectKind() {
         return (OBJECT_KIND);
@@ -74,6 +76,14 @@ public class MergeRequestEvent extends AbstractEvent {
         this.changes = changes;
     }
 
+    public List<Assignee> getAssignees() {
+        return assignees;
+    }
+
+    public void setAssignees(List<Assignee> assignees) {
+        this.assignees = assignees;
+    }
+
     public static class ObjectAttributes extends EventMergeRequest {
     }
 

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

@@ -92,7 +92,12 @@
       }
     },
     "work_in_progress": false,
-    "total_time_spent": 0
+    "total_time_spent": 0,
+    "human_total_time_spent": "0m",
+    "human_time_estimate": "1h",
+    "assignee_ids": [
+      96
+    ]
   },
   "labels": [],
   "repository": {
@@ -100,5 +105,12 @@
     "url": "git@example.com:awesome_space/awesome_project.git",
     "description": "",
     "homepage": "http://example.com/awesome_space/awesome_project"
-  }
+  },
+  "assignees": [
+    {
+      "name": "User1",
+      "username": "user1",
+      "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=40\u0026d=identicon"
+    }
+  ]
 }