Log Message:
py-faker: updated to 0.9.0

0.9.0:
.random_sample() now returns a list of unique elements instead of a set.
.random_sample_unique() is removed in favor of .random_sample().
Added random_choices(), random_elements() and random_letters().
Added faker.utils.distribution.choices_distribution_unique().
words(), password(), uri_path and pystr() now use the new the random_choices() \ 
method.

0.8.18:
Change blood group from 0 (zero) to O (capital letter O). Some locales do use \ 
'zero', but O is more common and it is the medical standard.
Fix alpha-2 country code for Haiti.
Fix abbreviation for Nunavut.
Standardized postcode in address providers. Now all locales are guaranteed to \ 
have a postcode method and may have a localized alias for it (eg: zipcode).
Fix typo in pt_BR Person perovider.
Fix timezone handling.
Use tzinfo when provided in date_of_birth.