Project Lead: django-model-utils

# Project lead request

@carljm wants to leave as lead and @charettes propose me to replace him.

As a member I already helped by the latest tree releases and I like to help where I can to keep django-model-utils up-to-date with django.

This request concerns changing the project lead for django-model-utils; no source files, tests, or implementation entry point are identified. Start by reviewing the project-lead transition discussion and confirming the maintainers' decision; it is done when the replacement lead is agreed and the repository's leadership records are updated.

Written by the indexing model from the issue text.