fix: regression build issue - Please add a @NgModule annotation

Author: xidedix

projects/coreui/angular/src/lib/breadcrumb/app-breadcrumb.service.ts

@@ -3,7 +3,10 @@ import { Router, ActivatedRoute, NavigationEnd } from '@angular/router';
 import { BehaviorSubject, Observable } from 'rxjs';
 import { filter } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+  }
+)
 export class AppBreadcrumbService {
 
   breadcrumbs: Observable<Array<Object>>;

projects/coreui/angular/src/lib/breadcrumb/public_api.ts

@@ -1,3 +1,2 @@
-export { AppBreadcrumbService } from './app-breadcrumb.service';
 export { AppBreadcrumbComponent } from './app-breadcrumb.component';
 export { AppBreadcrumbModule } from './app-breadcrumb.module';

projects/coreui/angular/src/public_api.ts

@@ -2,9 +2,9 @@
  * Public API Surface of @coreui/angular
  */
 
-export * from './lib/aside';
-export * from './lib/breadcrumb';
-export * from './lib/footer';
-export * from './lib/header';
-export * from './lib/sidebar';
+export * from './lib/aside/index';
+export * from './lib/breadcrumb/index';
+export * from './lib/footer/index';
+export * from './lib/header/index';
+export * from './lib/sidebar/index';
 // export * from './lib/shared/index';