Update to workshop v2

Author: AydinHassan

composer.json

@@ -12,7 +12,7 @@
     ],
     "require" : {
         "php" : ">=5.6",
-        "php-school/php-workshop": "^1.1"
+        "php-school/php-workshop": "^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.1",