delete the test file@

Author: chfw

tests/test_bug_fixes.py

@@ -28,4 +28,5 @@ def test_pyexcel_xls_issue_2(self):
         for i in range(4100):
             array.append([datetime.datetime.now()])
         data.update({"test": array})
-        s = xls.save_data("test.xls", data)
+        s = xls.save_data("test.xls", data)
+        os.unlink("test.xls")