• Simplify URL and view structure. Add support for multiple PK types
  based on URL pattern as well as natural key support via URL patterns.
• Remove django-compat dependency.
• Drop special case handling for unsupported Python/Django versions.
• Deprecate HIJACK_URL_ALLOWED_ATTRIBUTES setting favoring HIJACK_USER_URL_PATTERN.
• Deprecate URL names login_with_id, login_with_username and login_with_email favoring acquire.
• Deprecate URL name release_hijack favoring release.
• Deprecate views login_with_id, login_with_username and login_with_email favoring release_user_view.
• Deprecate view release_hijack favoring release_user_view.
• Reformat code and imports (black/isort).
• Remove old change log file from repo and distributions.