Add locale option and sort using locale (closes #349)

[SmallhillCZ]

What: Sorting is made to be locale aware

Why: sorting of non-ACII languages does not work correctly, see #349

How:

• contributorsSortLocale option is added to CLI to control which locale is going to be used for alphabetic sorting
• alphabetic sorting is done using String.localeCompare instead of _.sortBy to enable locale aware sorting

Checklist:

• Documentation
• Tests
• Ready to be merged
• Added myself to contributors table

TODOs:

1. husky git hook forces some whitespace changes by running prettier, is that correct?
2. can't find the documentation to add this into, is it meant to do another PR for the website?
3. there is a test for sorting already, is that enough, or should I create a special test for different locale?

[Berkmann18]

husky git hook forces some whitespace changes by running prettier, is that correct?

Nope, aside from when the lines are too long (since there's a max length for rows).

can't find the documentation to add this into, is it meant to do another PR for the website?

Yeah, the docs are in https://github.com/all-contributors/all-contributors.

there is a test for sorting already, is that enough, or should I create a special test for different locale?

Yes, please.

[SmallhillCZ]

Thanks, I will have a look into this next month, this one is too full already ;)