add support for Gibraltar phone numbers

[tsheaff]

Per the docs here, telephones in Gibraltar have CC +350 and are 8 digits long.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (9ba1735) to head (f5f6c6b).
⚠️ Report is 137 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2232   +/-   ##
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  Coverage   99.95%   99.95%           
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  Files         107      107           
  Lines        2405     2405           
  Branches      604      604           
=======================================
  Hits         2404     2404           
  Partials        1        1           

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[rubiin]

Plaese Add tests, update readme and also mention the source

[pano9000]

Thanks for the contribution, however your regex is too permissive, it allows way more than just mobile phone numbers - check the official ITU document here
https://www.itu.int/dms_pub/itu-t/oth/02/02/T02020000530007PDFE.pdf

However I am afraid this is has been abandoned completely, so marking it for deletion.

if nothing happens here in a week, I'd close this down