docs: update ECMA specification link

closes #2469

Author: yoavmmn

Readme.md

@@ -229,7 +229,7 @@ issue [#501](https://github.com/mysqljs/mysql/issues/501). (Default: `false`)
 * `bigNumberStrings`: Enabling both `supportBigNumbers` and `bigNumberStrings` forces big numbers
  (BIGINT and DECIMAL columns) to be always returned as JavaScript String objects (Default: `false`).
  Enabling `supportBigNumbers` but leaving `bigNumberStrings` disabled will return big numbers as String
- objects only when they cannot be accurately represented with [JavaScript Number objects] (http://ecma262-5.com/ELS5_HTML.htm#Section_8.5)
+ objects only when they cannot be accurately represented with [JavaScript Number objects] (https://tc39.es/ecma262/#sec-ecmascript-language-types-number-type)
  (which happens when they exceed the [-2^53, +2^53] range), otherwise they will be returned as
  Number objects. This option is ignored if `supportBigNumbers` is disabled.
 * `dateStrings`: Force date types (TIMESTAMP, DATETIME, DATE) to be returned as strings rather than