Cookiecutter doesn't work on 0.8.7 release

[NeilW]

Describe the bug
mesa startproject fails after pipenv install mesa

A valid repository for "/home/neil/.local/share/virtualenvs/baseline-economy-6fg_iky1/lib/python3.8/site-packages/mesa/cookiecutter-mesa" could not be found in the following locations:
...

Expected behavior
Generate the project layout

To Reproduce

• pipenv install mesa
• mesa startproject

Additional context
The cookiecutter directory from the repo is missing from the installation.
Additionally there is no help message for startproject when you run mesa --help

[jackiekazil]

@NeilW Ty for highlighting this error. I believe the pull request linked in this ticket will solve the issue in the next release.

If you would like to use this feature before this next release, you can install from the github repo after the PR is merged - pip install -e git+https://github.com/projectmesa/mesa#egg=mesa