Merge pull request #1 from php-school/AydinHassan-patch-1

Update composer.json

Author: mikeymike

composer.json

@@ -14,7 +14,7 @@
     ],
     "require-dev": {
         "phpunit/phpunit": "~4.1",
-        "squizlabs/php_codesniffer": "1.4.*"
+        "squizlabs/php_codesniffer": "~2.0"
     },
     "require": {
         "beberlei/assert": "^2.4"