v2.0.0

• Add Jinja2 support \o/
• Modern Python packaging
• Add note about django-tables2 in README
• Add documentation for Jinja2
• Include the space before the icon in settings
• Simpler code to render anchor
• Rename 'inverse' key to 'next' in SORT_DIRECTIONS
• Move settings to one upper level
• Use f-strings
• Fix error handling in queryset sorting
• Move sort_directions dict into dedicated file
• Regenerate test project with Django 3.1
• Remove support of Python 2 and upgrade to Django >=3.0
• Various cleanups