[Distutils][ANN] Python 3.7 now available in the manylinux docker images

Hi all, Thanks to Emanuele Gaifas [1], the manylinux docker images now include Python 3.7 (currently the rc1 release), so if you want you can now start building and uploading wheels for 3.7 ahead of its expected release on June 27 [2]. -n [1] https://github.com/pypa/manylinux/pull/196 [2] https://www.python.org/dev/peps/pep-0537/ -- Nathaniel J. Smith -- https://vorpus.org