Changed firebase-admin's deprecated send_all method for send_each (ja…

…zzband#715)

Remove python 3.6 support. (jazzband#718)

* Remove python 3.6 support.

* Remove unsupported code

Fixes twine reported warnings when building package. (jazzband#695)

Fixes twine reported warnings when building package. (jazzband#695)

docs: fix codecov badge. (jazzband#651)

Show coverage badge.

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