feat(isMobilePhone): added Anguilla mobile number validation

[elaine1129]

Added Anguilla mobile number validation (en-AI)

References:

• International Telecommunication Union

Checklist

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

[codecov]

Codecov Report

Merging #2007 (86de1dd) into master (450a2c0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2007   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       104           
  Lines         2203      2203           
  Branches       477       477           
=========================================
  Hits          2203      2203           

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 450a2c0...86de1dd. Read the comment docs.

[profnandaa]

LGTM, thanks for your contrib! 🎉

[profnandaa]

@rubiin -- once you have reviewed any PR and approved, you can add a ready-to-land tag that I can quick go through and put my approval and merge. Thanks for your reviews!

[rubiin]

WIll do