py-django-extensions: updated to 2.1.2

2.1.2
Changes:
Fix: AutoSlugField, fix check on list or tuple type

2.1.1
Removed support for Django versions before 1.11

Changes:
Fix: foreignkey_searchinput, remove unnecessary img tag
Fix: sqldiff, fix deprecated get_indexes call
Fix: AutoSlugField, check that any non-callable value passed to populate_from is a string type
Fix: tests, fix ChangingDirectoryTests: cd back in tearDown
Fix: show_template_tags, should handle AppConfig class in INSTALLED applications
Improvement: runserver_plus, reduce reraise pollution in traceback page
Improvement: dumpscript, prevent many2many field with custom intermediate models to be added directly on the parent model
Docs: fix typos

(adam)