Update doctrine constraint for fat skeleton as well (danke @stof)

bin/skeleton/fat_composer.json

@@ -18,7 +18,7 @@
         "symfony/twig-bridge": "2.1.*",
         "monolog/monolog": ">=1.0.0,<1.2-dev",
         "twig/twig": ">=1.2.0,<2.0-dev",
-        "doctrine/dbal": "2.1.*",
+        "doctrine/dbal": "2.2.*",
         "swiftmailer/swiftmailer": "4.1.*"
     }
 }