update uuid imports

src/app/core/shared/metadata.models.ts

@@ -1,4 +1,4 @@
-import * as uuidv4 from 'uuid/v4';
+import { v4 as uuidv4 } from 'uuid';
 import { autoserialize, Serialize, Deserialize } from 'cerialize';
 import { hasValue } from '../../shared/empty.util';
 /* tslint:disable:max-classes-per-file */

src/app/core/shared/uuid.service.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@angular/core';
-import * as uuidv4 from 'uuid/v4';
+import { v4 as uuidv4 } from 'uuid';
 
 @Injectable()
 export class UUIDService {