Add seed to the random choice

[scrummyin]

This allows for the ability to use a seed for the random number
generator. This means that a seed value can be used to get a
deterministic HRID, by using the same seed as previous on any
consecutive runs.

An example of the run is below

>>> import hrid
>>> hrid.hrid.HRID(seed='seed').generate() == hrid.hrid.HRID(seed='seed').generate()
True
>>> hrid.hrid.HRID(seed='seed').generate() == hrid.hrid.HRID(seed='seedsssssssss').generate()
False
>>> hrid.hrid.HRID(seed='seed').generate() == hrid.hrid.HRID(seed='seed').generate()
True

[pierec]

LGTM! Some tests would be in order.

[pierec]

@hnimminh is there any interest in merging this PR and releasing a new version of the package?

[hnimminh]

@pierec Somehow I missed this for longtime. I will update soon.
@scrummyin thanks for your contribution

[hnimminh]

@pierec https://pypi.org/project/hrid/ 0.2.4 ^^