Deprecate singleOrFail() in favour of sole()

tests/Feature/RoutingTest.php

@@ -57,7 +57,7 @@ class RoutingTest extends TestCase
 	{
 		//$this->seed(TestNodeHierarchy::class);
 
-		$do = Domain::where('name','a')->singleOrFail();
+		$do = Domain::where('name','a')->sole();
 		$zo = $do->zones->where('zone_id',100)->pop();
 		return $zo->addresses;
 	}