add Cyprus postal code check

[willhowlett]

feat: add Cyprus postal code check

Noticed CY postal code validation is missing https://en.wikipedia.org/wiki/Postal_codes_in_Cyprus

Checklist

• [x] PR contains only changes related; no stray files, etc.
• [ ] README updated (where applicable)
• [ ] Tests written (where applicable)

[codecov[bot]]

Codecov Report

Merging #2021 (f015b55) into master (86a07ba) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2021   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       104           
  Lines         2203      2203           
  Branches       477       477           
=========================================
  Hits          2203      2203           

Impacted Files	Coverage Δ
src/lib/isPostalCode.js	100.00% <ø> (ø)

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[rubiin]

Please add tests

[willhowlett]

Please add tests

@rubiin thanks, have done