feat(isMobilePhone): Added the regex for Malawi en-MW

[SimranSiddiqui]

feat(isMobilePhone): Added the regex for Malawi en-MW

Added Malawi mobile number validation (en-MW)

Resources:

• https://gazettes.africa/archive/mw/2022/mw-government-gazette-dated-2022-01-14-no-3.pdf
• https://www.itu.int/dms_pub/itu-t/oth/02/02/T02020000800002PDFE.pdf
• https://en.wikipedia.org/wiki/Telephone_numbers_in_Malawi

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

Patch and project coverage have no change.

Comparison is base (f074abd) 99.95% compared to head (a754fed) 99.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2267   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files         107      107           
  Lines        2436     2436           
  Branches      615      615           
=======================================
  Hits         2435     2435           
  Partials        1        1           

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

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[profnandaa]

LGTM, thanks for your contribution!