Fix linter error (#112)

Author: curquiza

CONTRIBUTING.md

@@ -52,6 +52,8 @@ composer test:unit
 composer lint:check
 # Linter (with auto-fix)
 composer lint:fix
+# PHPstan
+composer phpstan
 ```
 
 ### Using the Docker Environment

src/Engine.php

@@ -4,7 +4,6 @@
 
 namespace MeiliSearch\Bundle;
 
-use function count;
 use MeiliSearch\Client;
 use MeiliSearch\Exceptions\ApiException;