Adding changelog for fix of #45.
Adding changelog for fix of #45.

gregmuellegger/django-sortedm2m,fabrique/django-sortedm2m,fabrique/django-sortedm2m,gradel/django-sortedm2m,gradel/django-sortedm2m,gradel/django-sortedm2m,gregmuellegger/django-sortedm2m,gregmuellegger/django-sortedm2m,fabrique/django-sortedm2m