Log Message:
v36.2.0

* 1081: Environment markers indicated in ``install_requires``
  are now processed and treated as nameless ``extras_require``
  with markers, allowing their metadata in requires.txt to be
  correctly generated.

* 1053: Tagged commits are now released using Travis-CI
  build stages, meaning releases depend on passing tests on
  all supported Python versions (Linux) and not just the latest
  Python version.