add keyword 'repeat' for tqdm.contrib.itertools.product

[unickname3]

At now keyword 'repeat' don't work in tqdm.contrib.itertools.product()

From itertools docs:

itertools.product(*iterables, repeat=1)
....
To compute the product of an iterable with itself, specify the number of repetitions with the optional repeat keyword argument. For example, product(A, repeat=4) means the same as product(A, A, A, A).

There is my solution for this problem.

[bartbroere]

Hi, I made a similar PR some time ago: #1428. It's still open.

I don't care really which one of these gets merged, but now they're both linked at least.

[bartbroere]

Apart from some minor differences (in the tests for example), I only found one difference that seems to matter. I believe that the influence of actually using the repeat parameter is not yet reflected in the total in your version. On my branch I do this to get a correct total:

Suggested change

	total *= i
	total *= i
	total = total ** repeat

Without this fix I believe the progress bar will exceed 100% (after which it just starts displaying the amount of iterations).