[Wheel-builders] manylinux docker image now has python 3.6

[Nathaniel Smith]

Just as a heads up for anyone who was waiting before building wheels.

There's one minor issue, which is that it turns out the sqlite package
in 3.6 is incompatible with the libsqlite on centos 5, so for now the
3.6 builds have no sqlite package. This shouldn't you unless you
somehow use sqlite as part of your build process. (Does anyone use
sqlite as part of their build process?) Tracked here:
    https://github.com/pypa/manylinux/issues/90

-n

-- 
Nathaniel J. Smith -- https://vorpus.org