mark function as async

src/posts/posts.service.ts

@@ -26,7 +26,7 @@ export class PostsService {
   /**
    * Get all tags with admin endpoint, including unused ones
    */
-  public getTags(): Promise<Tag[]> {
+  public async getTags(): Promise<Tag[]> {
     return this.api.tags.browse({ limit: 'all' });
   }