docs: update IsNumberString docs

Author: vlapo

README.md

@@ -909,7 +909,7 @@ validator.isInstance(value, target); // Checks value is an instance of the targe
 | **String-type validation decorators**                                                                                                                                              |
 | `@IsBooleanString()`                            | Checks if a string is a boolean (e.g. is "true" or "false").                                                                     |
 | `@IsDateString()`                               | Checks if a string is a complete representation of a date (e.g. "2017-06-07T14:34:08.700Z", "2017-06-07T14:34:08.700 or "2017-06-07T14:34:08+04:00").                                                                                                    |
-| `@IsNumberString()`                             | Checks if a string is a number.                                                                                                  |
+| `@IsNumberString(options?: IsNumericOptions)`   | Checks if a string is a number.                                                                                                  |
 | **String validation decorators**                                                                                                                                                   |
 | `@Contains(seed: string)`                       | Checks if the string contains the seed.                                                                                          |
 | `@NotContains(seed: string)`                    | Checks if the string not contains the seed.                                                                                      |
@@ -948,7 +948,7 @@ validator.isInstance(value, target); // Checks value is an instance of the targe
 | `@IsPhoneNumber(region: string)`                | Checks if the string is a valid phone number. "region" accepts 2 characters uppercase country code (e.g. DE, US, CH).If users must enter the intl. prefix (e.g. +41), then you may pass "ZZ" or null as region. See [google-libphonenumber, metadata.js:countryCodeToRegionCodeMap on github](https://github.com/ruimarinho/google-libphonenumber/blob/1e46138878cff479aafe2ce62175c6c49cb58720/src/metadata.js#L33)                                                                                  |
 | `@IsMongoId()`                                  | Checks if the string is a valid hex-encoded representation of a MongoDB ObjectId.                                                |
 | `@IsMultibyte()`                                | Checks if the string contains one or more multibyte chars.                                                                       |
-| `@IsNumberString()`                             | Checks if the string is numeric.                                                                                                 |
+| `@IsNumberString(options?: IsNumericOptions)`   | Checks if the string is numeric.                                                                                                 |
 | `@IsSurrogatePair()`                            | Checks if the string contains any surrogate pairs chars.                                                                         |
 | `@IsUrl(options?: IsURLOptions)`                | Checks if the string is an url.                                                                                                  |
 | `@IsUUID(version?: "3"\|"4"\|"5"\|"all")`              | Checks if the string is a UUID (version 3, 4, 5 or all ).                                                                              |