Allow to create bottery project in current directory just like django.

[diegomaranhao]

When I create a new project I usually use the following flow:
1- I create a project directory
2- Enter into the directory and create a virtual env with 'python -v venv .venv
3- Activate my virtual env
4- Install my needs with pip
5- Start a new project in the created folder like 'django-admin startproject projectname .'

But with bottery doesn't accept the '.' parameter yet.