🐛 update readme

Author: chfw

.moban.d/custom_readme.rst.jj2

@@ -44,7 +44,7 @@ Otherwise, this library works OK with lxml 3.4.4 or above.
     >>> data = OrderedDict()
     >>> data.update({"Sheet 1": [[1, 2, 3], [4, 5, 6]]})
     >>> data.update({"Sheet 2": [[7, 8, 9], [10, 11, 12]]})
-    >>> io = StringIO()
+    >>> io = BytesIO()
     >>> save_data(io, data)
     >>> unused = io.seek(0)
     >>> # do something with the io

README.rst

@@ -128,7 +128,7 @@ Here's the sample code:
     >>> data = OrderedDict()
     >>> data.update({"Sheet 1": [[1, 2, 3], [4, 5, 6]]})
     >>> data.update({"Sheet 2": [[7, 8, 9], [10, 11, 12]]})
-    >>> io = StringIO()
+    >>> io = BytesIO()
     >>> save_data(io, data)
     >>> unused = io.seek(0)
     >>> # do something with the io