Update getOperations() to work with new structure

Author: grimmdude

src/spec/PathItem.php

@@ -116,7 +116,7 @@ public function getOperations()
     {
         $operations = [];
         foreach ($this->attributes() as $attribute => $type) {
-            if ($type === Operation::class && isset($this->$attribute)) {
+            if (\is_array($type) && $type[0] === Operation::class && isset($this->$attribute)) {
                 $operations[$attribute] = $this->$attribute;
             }
         }