Requiring illuminate/validation

The illuminate/validation is also required besides the other Illuminate packages.

Author: igorsantos07

composer.json

@@ -19,12 +19,13 @@
     "require": {
         "php": ">=5.3.0",
         "illuminate/support": "4.0.x",
-        "illuminate/database": "4.0.x"
+        "illuminate/database": "4.0.x",
+        "illuminate/validation": "4.0.x"
     },
     "autoload": {
         "psr-0": {
             "LaravelBook\\Ardent": "src/"
         }
     },
     "minimum-stability": "dev"
-}
+}