Switch to PHPCSStandards/PHP_CodeSniffer

The Squizlabs repo has been abandoned. The project continues in a fork in the PHPCSStandards organisation.

Ref:
* squizlabs/PHP_CodeSniffer 3932

Author: jrfnl

README.md

@@ -37,9 +37,9 @@ Symfony Polyfill Library | Corresponding PHPCompatibility Ruleset | Includes
 
 ## Requirements
 
-* [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer).
-    * PHP 5.3+ for use with [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) 2.3.0+.
-    * PHP 5.4+ for use with [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) 3.0.2+.
+* [PHP_CodeSniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer).
+    * PHP 5.3+ for use with [PHP_CodeSniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer) 2.3.0+.
+    * PHP 5.4+ for use with [PHP_CodeSniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer) 3.0.2+.
 
     Use the latest stable release of PHP_CodeSniffer for the best results.
     The minimum _recommended_ version of PHP_CodeSniffer is version 2.6.0.