python-pillow/Pillow — pull request #917 by mgedmin (2014-09-23 10:59:42+00:00)
Title: Mention that Image.tostring() is deprecated

This mirrors the deprecation notice in the docstring of fromstring().

I'm assuming that tostring() and fromstring() were both deprecated at the same time (Pillow 2.0); I haven't gone out of my way to verify that assumption.