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[network-topology] Add support for django 2.2

• python
• django

[openwisp-utils] Getting started with Travis

• travis
• ci
• easy

[netjsonconfig] Drop python 2 support

• python

[netdiff] Getting started with Travis

• travis
• ci
• easy

[bug] Server Error 500

• bug
• coding

[openwisp-template-library] Fix logo in Navbar

• html
• javascript
• reactjs
• react

[django-freeradius] Update django models to include new fields in Freeradius scheme

• python
• django
• sql
• freeradius
• database

[ci] Improve checkmigrations in openwisp-utils-qa-checks

[network-topology] Update dependencies & drop python 2 support

• python
• django

[openwisp-utils] Common CI script: make all checks even in case of failures.

• shell
• testing
• bash