Add newsfragment for #238 that refers to these docs

Author: hynek

changelog.d/238.change.rst

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+``attrs`` now ships its own `PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_ type hints.
+Together with `mypy <http://mypy-lang.org>`_'s ``attrs`` plugin, you've got all you need for writing statically typed code in both Python 2 and 3!
+
+At that occasion, we've also added `narrative docs <http://www.attrs.org/en/stable/types.html>`_ about type annotations in ``attrs``.