feat(isMobilePhone): add sr-ME locale

[Todor46]

Updated validator, test, and README to include Montenegro locale (sr-ME)

Reference for mobile phones: https://en.wikipedia.org/wiki/Telephone_numbers_in_Montenegro

Checklist

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.95%. Comparing base (83d6ffd) to head (59b9a6b). Report is 23 commits behind head on master.

:exclamation: Current head 59b9a6b differs from pull request most recent head dd1d94b

Please upload reports for the commit dd1d94b to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##            master    #2225      +/-   ##
===========================================
- Coverage   100.00%   99.95%   -0.05%     
===========================================
  Files          108      107       -1     
  Lines         2482     2405      -77     
  Branches       627      604      -23     
===========================================
- Hits          2482     2404      -78     
- Partials         0        1       +1     

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[rubiin]

@Todor46 can you fix the merge conflicts