feat(isMobilePhone): added Antigua and Barbuda mobile number validation (en-AG)

[jiaweilow]

added Antigua and Barbuda mobile number validation (en-AG)

Checklist

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

[codecov]

Codecov Report

Merging #2004 (7b8149b) into master (a17421a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2004   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       104           
  Lines         2120      2120           
  Branches       475       475           
=========================================
  Hits          2120      2120           

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

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[rubiin]

Thankyou for the contribution 🎉