[Checkins] [zopefoundation/DocumentTemplate] 659582: Update `isort` to version 5

[Jürgen Gmach]

  Branch: refs/heads/fix-flake8
  Home:   https://github.com/zopefoundation/DocumentTemplate
  Commit: 659582ab5187a0beecc0f03513144cef24124310
      https://github.com/zopefoundation/DocumentTemplate/commit/659582ab5187a0beecc0f03513144cef24124310
  Author: Jürgen Gmach <juergen.gmach at googlemail.com>
  Date:   2020-10-07 (Wed, 07 Oct 2020)

  Changed paths:
    M CHANGES.rst
    M setup.cfg
    M src/DocumentTemplate/DT_String.py
    M src/DocumentTemplate/_DocumentTemplate.py
    M src/DocumentTemplate/security.py
    M src/DocumentTemplate/tests/testDTML.py
    M src/DocumentTemplate/tests/test_DT_Raise.py
    M tox.ini

  Log Message:
  -----------
  Update `isort` to version 5

modified:   CHANGES.rst
modified:   setup.cfg
modified:   src/DocumentTemplate/DT_String.py
modified:   src/DocumentTemplate/_DocumentTemplate.py
modified:   src/DocumentTemplate/security.py
modified:   src/DocumentTemplate/tests/testDTML.py
modified:   src/DocumentTemplate/tests/test_DT_Raise.py
modified:   tox.ini