Openwisp-users

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- [dependencies] Added support for django 3.0, dropped support for django < 2.1
- [python] Dropped support for python 2.7

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- [dependencies] Added support for django 2.2

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- [admin] Show ``is_staff`` and ``is_superuser`` in user list
- [admin] Allow adding organization in user creation form
- [admin] ``UserCreationForm`` encourages to select the organization
- [admin] Non-superusers now can manage the users of their organization
- [admin] Made ``OrganizationOwner`` and ``OrganizationUser`` admins multi-tenant
- [admin] Disabled ``OrganizationOwnerAdmin`` by default
- [admin] Disabled ``OrganizationUserAdmin`` by default
- [admin] Disabled ``view_on_site`` for ``OrganizationUserInline``
- [admin] Added menu items
- [admin] Avoid 500 error in case of SMTP error when adding a new user
- [urls] Added social login views URLs
- [mixins] Moved ``MultitenantAdminMixin`` from openwisp-utils to openwisp-users
- [models] Add possibility to validate inverse relations
- [model] Added phone_number field to User
- [models] Add unique constraint on user.email
- [models] Email: allow ``NULL`` but set ``UNIQUE`` constraint
- [models] Added ``_validate_org_reverse_relation``

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- `26 <https://github.com/openwisp/openwisp-users/pull/26>`_:
[admin] Fixed Integrity error if trying to change email that exists
(thanks to `R9295 <https://github.com/R9295>`_)
- `27 <https://github.com/openwisp/openwisp-users/issues/27>`_:
[requirements] Added support for django 2.1 rc

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- `25 <https://github.com/openwisp/openwisp-users/pull/25>`_:
[docs] Updated setup instructions in README
(thanks to `AlmogCohen <https://github.com/AlmogCohen>`_)
- `20 <https://github.com/openwisp/openwisp-users/issues/20>`_:
[tests] Fixed pending migration check
- [requirements] Updated dependencies

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- fixed django 2.0 support and django-allauth to 0.35.0