Update GitlabAPI.java (#303)

issue.getId triggers a 404, Gitlab experts a Iid

Author: ericvergnaud

src/main/java/org/gitlab/api/GitlabAPI.java

@@ -2221,7 +2221,7 @@ public GitlabNote createNote(Serializable projectId, Integer issueId, String mes
     }
 
     public GitlabNote createNote(GitlabIssue issue, String message) throws IOException {
-        return createNote(String.valueOf(issue.getProjectId()), issue.getId(), message);
+        return createNote(String.valueOf(issue.getProjectId()), issue.getIid(), message);
     }
 
     /**