upgrade

vendor/ddeboer/data-import/src/Reader/IteratorReader.php

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+<?php
+
+namespace Ddeboer\DataImport\Reader;
+
+use Ddeboer\DataImport\Reader;
+
+/**
+ * Use an iterator as a reader
+ *
+ * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
+ */
+class IteratorReader extends \IteratorIterator implements Reader
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getFields()
+    {
+        return array_keys($this->current());
+    }
+}