Log Message:
py-django-extensions: updated to 2.2.7

2.2.7
Changes:
- Improvement: shell_plus, always add manage.py basedir to path for notebook kernel
- Improvement: docs, add zh-Hans locale
- Improvement: runserver_plus, fix broken import for werkzeug v1.0.0
- Improvement: runserver_plus, fix always trying to load StaticFilesHandler
- Improvement: pipchecker, fix import of PipSession