Add Zulu locale

[cyriaka90]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• 🧪 Added tests for changed code.
• 🛠️ All tests pass when run locally (run tox or make test to find out!).
• 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• 📚 Updated documentation for changed code.
• ⏩ Code is up-to-date with the master branch.

Description of Changes

Adds Zulu locale. :)

[codecov]

Codecov Report

Merging #1002 (1194234) into master (aa0e805) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1002   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines         2111      2131   +20     
  Branches       333       335    +2     
=========================================
+ Hits          2111      2131   +20     

Impacted Files	Coverage Δ
arrow/locales.py	100.00% <100.00%> (ø)

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[anishnya]

This locale actually wouldn't support dehumanize at the moment. Within tests/test_arrow.py we have a separate list of locales to test on since not all locales support the week format. If you add this locale to that test list, it would fail. At the moment, any locale that has Mapping[TimeFrameLiteral, Union[Mapping[str, str], str]] doesn't support dehumanize.

Everything else is good to go, just for the time being this locale wouldn't support dehumanize. (I'm working on a version of dehumanize that will :) )

[cyriaka90]

Ah, alright, thanks for pointing that out! :) So should I just remove Zulu from the dehumanize_locales?

[anishnya]

@cyriaka90 Yes.

[cyriaka90]

Done :)

[anishnya]

LGTM!