InnerHits fix

Author: fedorf4

src/Search/Collapsing/InnerHits.php

@@ -4,6 +4,7 @@
 
 use Ensi\LaravelElasticQuery\Contracts\DSLAware;
 use Ensi\LaravelElasticQuery\Search\Sorting\Sort;
+use Ensi\LaravelElasticQuery\Search\Sorting\SortCollection;
 use Webmozart\Assert\Assert;
 
 class InnerHits implements DSLAware