Add more field to NoteEvent test json

src/test/resources/org/gitlab4j/api/note-commit-event.json

@@ -30,6 +30,8 @@
   "object_attributes": {
     "id": 1243,
     "note": "This is a commit comment. How does this work?",
+    "discussion_id": "56e2b4210419aed077d47ca2dc00551c7c4ac882",
+    "type": "DiscussionNote",
     "noteable_type": "Commit",
     "author_id": 1,
     "created_at": "2015-05-17T18:08:09Z",

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

@@ -29,6 +29,8 @@
   "object_attributes": {
     "id": 1241,
     "note": "Hello world",
+    "discussion_id": "56e2b4210419aed077d47ca2dc00551c7c4ac882",
+    "type": "DiscussionNote",
     "noteable_type": "Issue",
     "author_id": 1,
     "created_at": "2015-05-17T17:06:40Z",

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

@@ -30,6 +30,8 @@
   "object_attributes": {
     "id": 1244,
     "note": "This MR needs work.",
+    "discussion_id": "56e2b4210419aed077d47ca2dc00551c7c4ac882",
+    "type": "DiscussionNote",
     "noteable_type": "MergeRequest",
     "author_id": 1,
     "created_at": "2015-05-17T18:21:36Z",

src/test/resources/org/gitlab4j/api/note-snippet-event.json

@@ -30,6 +30,8 @@
   "object_attributes": {
     "id": 1245,
     "note": "Is this snippet doing what it's supposed to be doing?",
+    "discussion_id": "56e2b4210419aed077d47ca2dc00551c7c4ac882",
+    "type": "DiscussionNote",
     "noteable_type": "Snippet",
     "author_id": 1,
     "created_at": "2015-05-17T18:35:50Z",