added datetime to date conversion to is_holiday() like in is_working_day()

[JanMalte]

I think both methods should behave the same if a datetime object is given.

[brunobord]

looks interesting. could you please provide a test (to avoid potential regressions)?

[JanMalte]

I have added a simple test case, just like the one for is_working_day()

[brunobord]

I'm sorry but this has failed the tests (flake8 issues here). Would you mind fixing them, please?

[brunobord]

mmm never mind... this flake8 issue is already in master.

(I really need to fix this travis.yml report right away)

[brunobord]

the good: I've fixed my travis build issue
the bad: now this branch is conflicting, I'm very sorry, but it shouldn't be hard to resolve these,
the good (again): once you'll rebase/merge from master in this branch and push to github, this branch will be built in travis (hopefully) and will report its build status here.

At the minute I'll see the "green" notification in your branch, it'll be merged.

Thank you for your patience.

[brunobord]

and btw, it'd be great if you amended the changelog

[JanMalte]

Ok, should be ready to merge