Openwisp-network-topology

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- Dropped support python 3.5 and below
- Dropped support django 2.1 and below
- Dropped support openwisp-users below 0.2.0
- Dropped support openwisp-utils 0.4.1 and below
- Dropped support django-netjsongraph below 0.6.0
- Added support for django 3.0

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- Updated dependencies
- Upgraded implementation of node addresses (via django-netjsongraph 0.5.0)

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- `fe9077c <https://github.com/openwisp/openwisp-network-topology/commit/fe9077c>`_:
[models] Fixed related name of Link.target

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- `cb7366 <https://github.com/openwisp/openwisp-network-topology/commit/cb7366>`_:
[migrations] Added a migration file for link_status_changed and openvpn_parser
- `22 <https://github.com/openwisp/openwisp-network-topology/pull/22>`_:
Added support to django 2.0
- `d40032 <https://github.com/openwisp/openwisp-network-topology/commit/d40032>`_:
[qa] Fixed variable name error
- `de45b6 <https://github.com/openwisp/openwisp-network-topology/commit/de45b6>`_:
Upgraded code according to latest django-netjsongraph 0.4.0 changes
- `17 <https://github.com/openwisp/openwisp-network-topology/pull/17>`_:
Integrated topology history feature from django-netjsongraph

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- `13 <https://github.com/openwisp/openwisp-network-topology/issues/13>`_:
Fixed the fetch and receive API bugs
- `15 <https://github.com/openwisp/openwisp-network-topology/pull/15>`_:
Imported admin tests from django-netjsongraph
- `16 <https://github.com/openwisp/openwisp-network-topology/pull/16>`_:
Added more tests by importing all from django-netjsongraph

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- `95f8ade <https://github.com/openwisp/openwisp-network-topology/commit/95f8ade>`_: [admin] Moved submit_line.html to `openwisp-utils <https://github.com/openwisp/openwisp-utils>`_