registration_id no longer hard-coded in DeviceViewSetMixin

`lookup_field` was declared in `DeviceViewSetMixin` and never used. Instead the create method referred to string literal instead of this field. No the field is used. You can inherit from `DeviceViewSetMixin`, redefined the `lookup_field` and use if with your views instead of having to rewrite the `create` method yourself

Bugfix release for apns dependency pinning.

Release 1.6.0

Release 1.5.0

Release 1.4.1

Release 1.4.0

Django Push Notifications 1.3.1

Django Push Notifications 1.3.0

Release v1.2.1

Release v1.2.0