fixed material numbers in new dialog

src/app/models/changelog.model.spec.ts

@@ -0,0 +1,7 @@
+import { ChangelogModel } from './changelog.model';
+
+describe('ChangelogModel', () => {
+  it('should create an instance', () => {
+    expect(new ChangelogModel()).toBeTruthy();
+  });
+});

src/app/models/changelog.model.ts

@@ -0,0 +1,9 @@
+import {BaseModel} from './base.model';
+
+export class ChangelogModel extends BaseModel {
+  date: Date;
+  action: string;
+  collection: string;
+  conditions: {[key: string]: any};
+  data: {[key: string]: any};
+}