Remove "<2.7" constraint on symfony/console

Author: nicolas-grekas

composer.json

@@ -43,7 +43,7 @@
         "tubalmartin/cssmin": "2.4.8-p4",
         "magento/magento-composer-installer": ">=0.1.11",
         "braintree/braintree_php": "3.7.0",
-        "symfony/console": "~2.3 <2.7",
+        "symfony/console": "~2.3",
         "symfony/event-dispatcher": "~2.1",
         "symfony/process": "~2.1",
         "phpseclib/phpseclib": "2.0.*",