Updated CONTRIBUTING.md (composer scripts)

Author: michalbundyra

CONTRIBUTING.md

@@ -53,26 +53,28 @@ $ composer install
 To run tests, use the PHPUnit executable installed by Composer:
 
 ```console
-$ ./vendor/bin/phpunit
+$ composer test
 ```
 
 ## CODING STANDARDS
 
 While Apigility uses Zend Framework 2 coding standards, in practice, we check
-standards using [php-cs-fixer](https://github.com/fabpot/PHP-CS-Fixer) (which is
-installed via Composer with other dependencies). To check for CS issues:
+standards against PSR-1/2. To check for CS issues:
 
 ```console
-$ ./vendor/bin/php-cs-fixer fix . --dry-run
+$ composer cs-check
 ```
 
-This will report CS issues. Alternately, you can have the tool fix them for you
-by omitting the `--dry-run` switch:
+This will report CS issues. You can also attempt to fix many reported errors
+automatically:
 
 ```console
-$ ./vendor/bin/php-cs-fixer fix .
+$ composer cs-fix
 ```
 
+If you use `cs-fix` to fix issues, make certain you add and commit any files
+changed!
+
 ## Conduct
 
 Please see our [CONDUCT.md](CONDUCT.md) to understand expected behavior when interacting with others in the project.