Return false when there is just one digit

[Rodrigo Ferreira de Souza]

In [4]: cpfcnpj.validate('11111111111')
Out[4]: True

In [5]: cpfcnpj.validate('22222222222')
Out[5]: True

[Matheus Cardoso]

It was already implemented.

[Rodrigo Ferreira de Souza]

@matheuscas yeap, I did in a previous pull request #9 I think we forget to close the issue :)