Django-icomoon

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* Fixed short description from app ``__init__`` docstring as it seems to cause
installation to fail because of setuptools>=59 which introduces incompatible backward
error with description which contains a newline;

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**Project and package refactoring**

* Drop ``six`` usage;
* Drop ``django-braces`` usage;
* Migrate to ``setup.cfg`` for package configuration;
* Cover every supported Django versions with tox;
* Updated demo project with sandbox;
* Add documentation on ReadTheDoc;
* Update ``icon_map.scss`` template to include a Sass map for available icons,
close 11;

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**This has not be released into a package on Pypi** due to packaging
configuration problem, the **1.4.0 release resolve everything** without any
behavior changes.

This is a maintenance release for recent (>=2.0) Django environment.

Pin your project dependancies to ``django-icomoon<1.3.0`` if your environment
does not match the new requirements.

* Drop support for Django<=2.0, add support for Django 2.0 to 3.1;
* Drop support for Python2, at least Python 3.6 is required;

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* Fix Sass template for bad selector, close 10;
* Cleaned icon gallery template;
* Dropped support for Django <= 1.8;
* Better Makefile for development install;

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* Fixed missing ``mixin()`` in Sass template;

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* Fixed compatibiliy with django>=1.10 in management command, close 9;
* Added missing semicolon on pseudo element classes in CSS template;
* Added ``icon_map.scss`` template to create an useful Sass file instead of
simple CSS classes, close 5;