Log Message:
py-django-extensions: updated to 3.1.5

3.1.5:
fix markdownlint errors
fix for removed get_installed_distributions function
crude way slow down to avoid HTTPTooManyRequests
ignore failing get_installed_distributions import for mypy

3.1.4
- Fix: set_default_site, improve django.contrib.sites application detection
- Improvement: documentation, Fix name of mixin in docs
- Improvement: mypy, type ignore backwards compatible imports
- Improvement: graph_models, add --rankdir to change graph direction
- Improvement: runserver_plus, Add --sql-truncate cli modifier
- Improvement: shell_plus, Add --sql-truncate cli modifier