describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Update Django Piston codebase to ensure compatibility with Python 3.7+ by modernizing deprecated Django imports and string handling patterns.

Main changes:

• Replaced deprecated django.core.urlresolvers with django.urls imports across authentication, documentation, emitters and utilities modules
• Updated render_to_response calls to use django.shortcuts.render function with explicit request context parameter
• Modified ForeignKey definitions to include required on_delete=models.CASCADE parameter for Django 2.0+ compatibility

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