Updated CONTRIBUTING to reflect phpcs usage

Author: weierophinney

CONTRIBUTING.md

@@ -77,24 +77,24 @@ To do so:
 
 ## Running Coding Standards Checks
 
-This component uses [php-cs-fixer](http://cs.sensiolabs.org/) for coding
+This component uses [phpcs](https://github.com/squizlabs/PHP_CodeSniffer) for coding
 standards checks, and provides configuration for our selected checks.
-`php-cs-fixer` is installed by default via Composer.
+`phpcs` is installed by default via Composer.
 
 To run checks only:
 
 ```console
-$ ./vendor/bin/php-cs-fixer fix . -v --diff --dry-run --config-file=.php_cs
+$ ./vendor/bin/phpcs
 ```
 
-To have `php-cs-fixer` attempt to fix problems for you, omit the `--dry-run`
-flag:
+`phpcs` provides another tool, `phpcbf`, that can automatically fix many common
+problems:
 
 ```console
-$ ./vendor/bin/php-cs-fixer fix . -v --diff --config-file=.php_cs
+$ ./vendor/bin/phpcbf
 ```
 
-If you allow php-cs-fixer to fix CS issues, please re-run the tests to ensure
+If you allow `phpcbf` to fix CS issues, please re-run the tests to ensure
 they pass, and make sure you add and commit the changes after verification.
 
 ## Recommended Workflow for Contributions