feat(isLicensePlate): Support for Pakistani vehicles (#2207)

* Pakistan vehicles license plate support

* Readme and test cases updated

* Update README.md

Author: anasshakil

README.md

@@ -142,7 +142,7 @@ Validator                               | Description
 **isJWT(str)**                         | check if the string is valid JWT token.
 **isLatLong(str [, options])**                      | check if the string is a valid latitude-longitude coordinate in the format `lat,long` or `lat, long`.<br/><br/>`options` is an object that defaults to `{ checkDMS: false }`. Pass `checkDMS` as `true` to validate DMS(degrees, minutes, and seconds) latitude-longitude format.
 **isLength(str [, options])**              | check if the string's length falls in a range.<br/><br/>`options` is an object which defaults to `{ min: 0, max: undefined }`. Note: this function takes into account surrogate pairs.
-**isLicensePlate(str, locale)**     | check if the string matches the format of a country's license plate.<br/><br/>`locale` is one of `['cs-CZ', 'de-DE', 'de-LI', 'en-IN', 'es-AR', 'hu-HU', 'pt-BR', 'pt-PT', 'sq-AL', 'sv-SE']` or `'any'`.
+**isLicensePlate(str, locale)**     | check if the string matches the format of a country's license plate.<br/><br/>`locale` is one of `['cs-CZ', 'de-DE', 'de-LI', 'en-IN', 'en-PK', 'es-AR', 'hu-HU', 'pt-BR', 'pt-PT', 'sq-AL', 'sv-SE']` or `'any'`.
 **isLocale(str)**                       | check if the string is a locale.
 **isLowercase(str)**                    | check if the string is lowercase.
 **isLuhnNumber(str)**                    | check if the string passes the [Luhn algorithm check](https://en.wikipedia.org/wiki/Luhn_algorithm).

src/lib/isLicensePlate.js

@@ -13631,6 +13631,30 @@ describe('Validators', () => {
       ],
       invalid: ['mh04ad0045', 'invalidlicenseplate', '4578', '', 'GJ054GH4785'],
     });
+    test({
+      validator: 'isLicensePlate',
+      args: ['en-PK'],
+      valid: [
+        'P 1789',
+        'RL745',
+        'RIR 5421',
+        'KHI 201',
+        'LB6571',
+        'LHR-786-23',
+        'AJGB 816-10',
+        'LES 7891 06',
+        'IDS 7871',
+        'LEH 4607 15',
+      ],
+      invalid: [
+        'ajgb 816-10',
+        ' 278-37',
+        'ABZ-27',
+        '',
+        'ABC-123-',
+        'D 272',
+      ],
+    });
   });
   it('should validate VAT numbers', () => {
     test({