fix the orphen reference to get_apps() function
fix the orphen reference to get_apps() function

When dropping support for django 1.6 and 1.7, the call to get_apps() function was left behind.

seealso:
https://github.com/django-extensions/django-extensions/commit/f4f82d0089695a5608cb3b0389b4163d1c2eb90a
https://github.com/django-extensions/django-extensions/commit/975a308756984da72f0b9a25a067e27dd09791db
https://github.com/django-extensions/django-extensions/commit/358178d5e676287b3113551da6c05d692f2336e6
https://github.com/django-extensions/django-extensions/commit/3a0ca9e40a11729d30cc3f2d916c446321805f97
linuxmaniac/django-extensions,django-extensions/django-extensions,linuxmaniac/django-extensions,django-extensions/django-extensions,haakenlid/django-extensions,haakenlid/django-extensions,django-extensions/django-extensions,linuxmaniac/django-extensions,haakenlid/django-extensions