Added passport number validation for Nigeria (NG) (updated)

[marvelefe]

What's inside

• Added passport number validation for Nigeria (NG)
• Contains feedback from the initial PR and closes #1891

What I've done

• Added passport number validation regex for Nigeria (NG) 8362c63fddc5454a717518f78281f746b1e49793
• Added test for NG passport number validation 8278d24636ed7be75ad96532b68ce5a34417fad8
• Added 'NG' country code to passport number validation section in README.md a6adeab7d4be541ec1a7dfad266e6e4bc54e7d7b

Checklist

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

[codecov[bot]]

Codecov Report

Merging #1959 (a94de3e) into master (cfcf911) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1959   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          103       103           
  Lines         2097      2097           
  Branches       473       473           
=========================================
  Hits          2097      2097           

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

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[marvelefe]

Hello @marvelefe Thank you for your PR ! Mostly LGTM, can you please fix the formatting issues (please check the CI pipeline results) ?

Fixed the formatting issues