add Saint Martin (French) mobile number validation

[0APOCALYPSE0]

Added validation for Saint Martin (French) on isMobilePhone. referred issue: #1761 Source: https://en.wikipedia.org/wiki/Collectivity_of_Saint_Martin

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

All modified lines are covered by tests :white_check_mark:

Comparison is base (b958bd7) 99.95% compared to head (10e7790) 99.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2297      +/-   ##
==========================================
- Coverage   99.95%   99.95%   -0.01%     
==========================================
  Files         107      107              
  Lines        2454     2449       -5     
  Branches      619      619              
==========================================
- Hits         2453     2448       -5     
  Partials        1        1              

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

... and 3 files with indirect coverage changes

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[0APOCALYPSE0]

Hi, I am new to codecov. Can anybody help me here to pass codecov/project check? Thanks

[0APOCALYPSE0]

@WikiRik Hi, Could you please review and approve my PR? Thanks