Fix Dutch typo

[gizburdt]

I saw my surname in the faked data, but it is misspelled. The misspelled version doesn't exist in The Netherlands.

[ppelgrims]

Thank you very much for your PR but even though this is a completely valid PR, it adds very low value. This package follows semantic versioning, current releases are minor ones. This enforces backwards-compatible bug fixes, changing existing data sets might break things for other users. From contributing:
Avoid changing existing sets of data. Some developers use Faker with seeding for unit tests ; changing the data makes their tests fail.

[gizburdt]

All clear, thanks for the reply :)

[fzaninotto]

@ppelgrims I think this change is valid. It will only break tests in very rare cases (not all cases based on Dutch names). So I'm going to merge it. Thanks!

[ppelgrims]

Yeah, I'm not sure how strict this is to be enforced. Anyway, nice work @gizburdt !