Matplotlib and Python 3.7

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Now that Python 3.7 has reached release candidate status, I thought that
I should try it.  But I use Matplotlib a lot and this fails to install
with Python 3.7 because "freetype and png cannot be installed" (I am
using Windows 10).

I am wondering if anyone knows how to work around this issue?

I looked for a way to report the issue to the Matplotlib team but the
only forum I could find for reporting issues required me to create an
account, which I don't want to do.