Version 1.0.1 has only been out for a day now. It has a small number of changes compared to 1.0.0.
I'll be bumping my overlay version today and if everything goes smoothly (I'm sure it will), I'll move it to the tree this coming Saturday (Sep 24). If anyone wants to bump it faster than this, feel free.
It seems that aiodns is not a hard requirement, since aiohttp has a fallback ThreadedResolver implementation. Note that aiodns requires pycares, which requires a bundled/patched version of c-ares.
I've added these packages to gentoo: dev-python/async_timeout dev-python/aiodns dev-python/pycares The aiohttp-1.0.1 unit tests require pytest-mock, so I'm creating an ebuild for that now.
This is in git: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=bbd55bc1b7769fb15f300a6b7c977ee5e8a30f39