Add long_description_content_type to setup.cfg [skip ci]

As suggested by https://packaging.python.org/guides/making-a-pypi-friendly-readme/ and https://github.com/pypa/warehouse/issues/3884#issuecomment-386188844, this may now be necessary on warehouse. Adding it to setup.py results in 'distutils/dist.py:274: UserWarning: Unknown distribution option: 'long_description_content_type'' even with setuptools 39, but setup.cfg is equivalent. I verified that PKG-INFO has the appropriate 'Description-Content-Type: text/x-rst' field.

Add long_description_content_type to setup.cfg [skip ci]
As suggested by https://packaging.python.org/guides/making-a-pypi-friendly-readme/ and https://github.com/pypa/warehouse/issues/3884#issuecomment-386188844, this may now be necessary on warehouse. Adding it to setup.py results in 'distutils/dist.py:274: UserWarning: Unknown distribution option: 'long_description_content_type'' even with setuptools 39, but setup.cfg is equivalent. I verified that PKG-INFO has the appropriate 'Description-Content-Type: text/x-rst' field.
fdfd7328 · Jason Madden · b0f738c2 · fdfd7328
Commit fdfd7328 authored May 03, 2018 by Jason Madden
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setup.cfg setup.cfg +3 -0

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--- a/setup.cfg
+++ b/setup.cfg
@@ -4,3 +4,6 @@ universal = 0
 [zest.releaser]
 python-file-with-version = src/gevent/__init__.py
 create-wheel = no
+
+[metadata]
+long_description_content_type = text/x-rst