Propose to publish wheels for armv7/arm64

[jokester]

to make arm user's life easier :)

Can this be done with TravisCI's build matrix in https://github.com/python-pillow/pillow-wheels/blob/master/.travis.yml ?

[hugovk]

See also #4655.

[mattip]

xref python-pillow/pillow-wheels#147 which adds wheels for arm64 and PyPy

[radarhere]

Ok, python-pillow/pillow-wheels#147 has been merged. arm64 wheels should be available with the next Pillow release, due out on July 1