Update Slim

Author: mathmarques

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": ">=5.5.0",
         "smarty/smarty": "~3.1",
-        "slim/slim": "^3.0@beta"
+        "slim/slim": "^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.0"