feat(isPostalCode): improve TW locale (#2529)

Co-authored-by: Rik Smale <13023439+WikiRik@users.noreply.github.com>

Author: Crocsx

src/lib/isPostalCode.js

@@ -71,7 +71,7 @@ const patterns = {
   SK: /^\d{3}\s?\d{2}$/,
   TH: fiveDigit,
   TN: fourDigit,
-  TW: /^\d{3}(\d{2})?$/,
+  TW: /^\d{3}(\d{2,3})?$/,
   UA: fiveDigit,
   US: /^\d{5}(-\d{4})?$/,
   ZA: fourDigit,

test/validators.test.js

@@ -12576,6 +12576,7 @@ describe('Validators', () => {
           '399',
           '935',
           '38842',
+          '546023',
         ],
       },
       {