[Python-checkins] [python/cpython] d9a21b: update NEWS entries

[GitHub]

  Branch: refs/heads/bpo-30014-selectors-modify-speedup
  Home:   https://github.com/python/cpython
  Commit: d9a21b94627d21daf3890bd53c16bdde4cd2c04b
      https://github.com/python/cpython/commit/d9a21b94627d21daf3890bd53c16bdde4cd2c04b
  Author: Giampaolo Rodola <g.rodola at gmail.com>
  Date:   2017-06-07 (Wed, 07 Jun 2017)

  Changed paths:
    M Doc/whatsnew/3.7.rst
    M Lib/selectors.py
    M Misc/NEWS

  Log Message:
  -----------
  update NEWS entries