Added $_regionCollection property to class

Author: maxalmonte14

app/code/Magento/CustomerImportExport/Model/Import/Address.php

@@ -101,6 +101,13 @@ class Address extends AbstractCustomer
      */
     protected $_entityTable;
 
+    /**
+     * Region collection instance
+     *
+     * @var string
+     */
+    protected $_regionCollection;
+
     /**
      * Countries and regions
      *