Update available postgres versions
Update available postgres versions

The listed versions in the documentation were out of sync with those given when running cookiecutter as recommended in the documentation.
pydanny/cookiecutter-django,pydanny/cookiecutter-django,trungdong/cookiecutter-django,ryankanno/cookiecutter-django,ryankanno/cookiecutter-django,ryankanno/cookiecutter-django,pydanny/cookiecutter-django,trungdong/cookiecutter-django,trungdong/cookiecutter-django,trungdong/cookiecutter-django,pydanny/cookiecutter-django,ryankanno/cookiecutter-django