• Fix leading zeros.
• Test case updated.

const isValidPort = isPort('0001'); // false

closes #2208

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 Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.95%. Comparing base (9ba1735) to head (fcbe17a).
Report is 18 commits behind head on master.

❗ Current head fcbe17a differs from pull request most recent head 83ae52c. Consider uploading reports for the commit 83ae52c to get more accurate results

@@           Coverage Diff           @@
##           master    #2211   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files         107      107           
  Lines        2405     2405           
  Branches      604      604           
=======================================
  Hits         2404     2404           
  Partials        1        1           

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