Pydelivengo

Allow user to select API version (2.4 default)

We added Python 3.7.2

And update requests too.

**Now**, you can add the dict `params` to `get_pli` as the example bellow:

python3
api = PyDelivengo(api_authorization) initialize
api.get_pli(id_pli, print_pdf=True, params={'support': 32}) support 32 = pdf 10 x 15 cm
pdf = response['data']['documents_supports'] get the pdf in ascii format


_(I should probably check if more functions need the params dict)_