fix: file name

Author: motecshine

src/Contract/WriterContract.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Irain\ExportExcel\Contract;
+
+interface WriterContract
+{
+
+    public function buildAndOutStream($path);
+
+    public function save($path);
+
+    public function buildTable();
+
+    public function buildTableHeader();
+}