[issue33791] Update README.rst to mention third-party OpenSSL needed for macOS builds

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 94b5fabe81fc1ee7a49a06db117ca2f2d1c80526 by Miss Islington (bot) in branch '3.6':
bpo-33791: Update README for macOS users (GH-7471)
https://github.com/python/cpython/commit/94b5fabe81fc1ee7a49a06db117ca2f2d1c80526


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nosy: +miss-islington

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