Log Message:
v36.4.0

* 1075: Add new ``Description-Content-Type`` metadata field. `See here for
  documentation on how to use this field.

* 1068: Sort files and directories when building eggs for
  deterministic order.

* 196: Remove caching of easy_install command in fetch_build_egg.
  Fixes issue where ``pytest-runner-N.N`` would satisfy the installation
  of ``pytest``.

* 1129: Fix working set dependencies handling when replacing conflicting
  distributions (e.g. when using ``setup_requires`` with a conflicting
  transitive dependency, fix 1124).

* 1133: Improved handling of README files extensions and added
  Markdown to the list of searched READMES.

* 1135: Improve performance of pkg_resources import by not invoking
  ``access`` or ``stat`` and using ``os.listdir`` instead.