feat(@schematics/angular): add UrlTree to CanActivate method signature

Author: SIDENIS\Andrey.Chalkin

packages/schematics/angular/guard/files/__name@dasherize__.guard.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@angular/core';
-import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
+import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from '@angular/router';
 import { Observable } from 'rxjs';
 
 @Injectable({
@@ -8,7 +8,7 @@ import { Observable } from 'rxjs';
 export class <%= classify(name) %>Guard implements CanActivate {
   canActivate(
     next: ActivatedRouteSnapshot,
-    state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean {
+    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
     return true;
   }
 }