Django-netjsongraph

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- [bug] fixed broken testcase in 0.6.3 release
- [change] minor changes handle post-releases in ``get_version()``

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- [add] Support of openwisp-utils~=0.5.0
- [fixed] Minor issues with testcases

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- Renamed api setting ``TOPOLOGY_RECEIVE_BASEURL`` -> ``TOPOLOGY_API_BASEURL``
- Renamed api setting ``TOPOLOGY_RECEIVE_URLCONF`` -> ``TOPOLOGY_API_URLCONF``

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- Added settings option TOPOLOGY_RECEIVE_URLCONF & TOPOLOGY_RECEIVE_BASEURL
- Move from jsonfield2 to jsonfield

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- Dropped Python 3.5 and below
- Dropped django 2.1 and below
- Dropped netdiff 0.6 and below
- Dropped openwisp-utils 0.3 and below
- Moved ``ReceiveUrlAdmin`` & ``get_random_key`` logic to openwisp-utils
- Moved from jsonfield to jsonfield2 3.X.X
- Added Django 3.0 support
- Added netdiff 0.7 support
- Added openwisp-utils 0.4 support

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- Upgraded dependencies (django and django-rest-framework)
- Changed implementation of node addresses