describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Update Django Piston codebase to support Django 2.1 by migrating deprecated import paths and applying black code formatter for consistent style.

Main changes:

• Migrated deprecated Django imports from django.core.urlresolvers to django.urls module for Django 2.1 compatibility
• Updated ForeignKey fields to include required on_delete=models.CASCADE parameter per Django 2.1 requirements
• Applied black formatter across entire codebase converting single quotes to double quotes and standardizing whitespace

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